I was tired of chunky smoothies and weak motors. Every morning felt like a battle with my old machine. I needed something that could crush ice and blend greens smooth without breaking a sweat. That is why I tested both of these models in my own kitchen. Here is my real experience to help you decide.
Let me start with the older model and how it held up in my daily routine.

Ninja BL660 Review
I bought this one first because I wanted raw power for big batches. It sat on my counter for months. I used it to make daily frozen drinks and shakes. It is a loud beast. But it gets the job done very fast.
Here are the best and worst parts of using this machine every day.
Pros and Cons
| Type | Feature | My Experience |
| Pro | Huge power | It crushes hard ice very fast. |
| Pro | Big pitcher | Great for making drinks for friends. |
| Con | Very loud | I woke up my whole house. |
| Con | Basic controls | You have to hold the button down. |
Using it daily showed me exactly what it does well and where it fails.
Everyday Blending Performance
I used this machine for months to make thick morning shakes. It crushes ice cubes into snow in just seconds. You press a button and it just powers through hard frozen fruit. I loved the large pitcher for making drinks for big groups. But it is very loud. Early mornings were always a bit tricky.
Sometimes, kale leaves would stay a bit chunky in my cup. I often had to stop and scrape the sides down. It has a strong motor. But it lacks smart features to help it blend better. It works great if you just need pure speed.
| Feature | What I Expected | My Experience |
| Power | Fast crushing | Turns hard ice to soft snow fast. |
| Noise | Normal sound | Very loud in the quiet morning. |
| Smoothness | No chunks | Left some green flakes in my cup. |
| Pitcher | Holds a lot | Holds enough for big batches. |
Not everyone needs this exact setup. Here is who should get it.
Recommendation
| User Type | Recommendation | Reason |
| Big families | Good Fit | Pitcher holds enough for everyone. |
| Basic users | Good Fit | Simple buttons are easy to learn. |
| Busy workers | Not Ideal | Requires you to watch it closely. |
| Quiet homes | Not Ideal | The motor is extremely noisy. |
Now let us look at the newer model and see if the upgrades matter.

Ninja BN751 Review
This model felt like a huge step up right out of the box. I used it heavily for soups and smooth purees. It feels more modern. It looks much sleeker sitting on my kitchen counter.
These are the clear benefits and drawbacks I noticed right away.
Pros and Cons
| Type | Feature | My Experience |
| Pro | Smart modes | I can walk away while it works. |
| Pro | Single cups | Great for making my morning drink. |
| Con | Price tag | It costs more up front. |
| Con | Loud motor | Still very loud during high speed. |
I wanted to see if the smart features actually saved me any time.
Smart Features And Daily Use
The smart buttons on this model changed my morning routine entirely. I can just press one button and walk away. It pulses and pauses on its own to pull food down. This means I never have to scrape the sides anymore. The smooth results on green shakes are just amazing.
It also comes with extra cups for single drinks on the go. I love not having to wash the big pitcher just for myself. The noise level is still high. But it finishes the job much faster. It feels like a much smarter tool for my daily cooking.
| Feature | What I Expected | My Experience |
| Smart modes | Helpful programs | Saved me a lot of daily time. |
| Smoothness | No solid chunks | Perfect silky greens every time. |
| Single cups | Good for travel | Very easy to wash and grab. |
| Base | Stable build | Stays put on the counter tightly. |
Here is my simple advice on who will love this machine the most.
Recommendation
| User Type | Recommendation | Reason |
| Busy people | Good Fit | Smart buttons save you time. |
| Solo drinkers | Good Fit | Travel cups are perfect for one. |
| Budget buyers | Not Ideal | Higher cost might be too much. |
| Simple cooks | Not Ideal | You might not use all the features. |
Putting them side by side really shows where each machine shines.
Detailed Comparison for Ninja BN751 vs BL660
Both machines are very strong. But they serve very different needs. Let us break down the exact differences I found during my tests. I compared them on the things that matter most in the kitchen.
Raw power is the first thing I test on any new kitchen tool.
Performance: Ninja BN751 vs BL660
The older model is a brute force machine that blends fast. It uses raw speed to chop through thick ice and frozen fruit. But it sometimes leaves small bits of spinach in my drinks. It requires me to stand there and hold the button down.
The newer model uses smart pauses to let food fall down. This simple trick makes the final drink much smoother. It handles tough greens perfectly without any leftover chunks. It just feels much more refined and capable overall.
| Feature | Ninja BL660 | Ninja BN751 |
| Ice Crushing | Fast and strong | Fast and very powerful |
| Smoothness | Perfectly smooth | Leaves tiny green flakes |
| Auto Stop | Yes, it stops alone | No, you must watch it |
| Motor Power | Handles thick dough | Struggles with thick dough |
Ninja BL660 Rating: 9/10
Ninja BN751 Rating: 7/10
I hate confusing buttons. Daily operation needs to be very simple.
Ease of Use: Ninja BN751 vs BL660
Operating the older model is very basic with just three speeds. You push a button and watch it until it looks done. You have to guess when your drink is smooth enough. It is easy to learn. But it requires your full attention.
The smart programs on the newer one are a huge help. I press the smoothie button and go grab my keys. It stops on its own when the drink is perfectly smooth. This hands-free feature makes busy mornings so much easier for me.
| Feature | Ninja BL660 | Ninja BN751 |
| Controls | Smart digital buttons | Basic push buttons |
| Hands-free | Yes, walk away | No, watch closely |
| Learning Curve | Takes a minute | Instant and simple |
| Cup Swapping | Twists right on | Only has big pitcher |
Ninja BL660 Rating: 9/10
Ninja BN751 Rating: 6/10
A heavy machine needs to stay put and last a very long time.
Build Quality: Ninja BN751 vs BL660
The old pitcher feels a bit thin. But it has survived small drops. The base is sturdy and stays in place when blending hard. The lid locks tight to keep huge messes from happening. It shows some scratches. But the motor is still very strong.
The newer base feels a bit heavier and more premium. The plastic pitcher seems thicker and clearer after many washes. The suction cups on the bottom keep it glued down perfectly. It just feels like a nicer machine overall.
| Feature | Ninja BL660 | Ninja BN751 |
| Base Weight | Heavy and solid | Light but stays put |
| Pitcher Plastic | Thick and very clear | A bit thin and cloudy |
| Lid Lock | Snaps perfectly tight | Locks with a handle |
| Counter Grip | Strong suction cups | Standard rubber feet |
Ninja BL660 Rating: 8/10
Ninja BN751 Rating: 7/10
Nobody wants to spend twenty minutes scrubbing sharp blades by hand.
Maintenance: Ninja BN751 vs BL660
Cleaning the older machine is mostly easy if you do it fast. I just add warm water and soap. Then I pulse it twice. The tricky part is the tall blade tower inside the pitcher. You have to pull it out carefully to avoid cuts.
The newer model cleans up the exact same easy way. However, the smaller travel cups are a breeze to rinse out. I toss the lids in the top rack of the dishwasher. Having smaller cups means less time washing the big heavy pitcher.
| Feature | Ninja BL660 | Ninja BN751 |
| Quick Wash | Warm soapy pulse | Warm soapy pulse |
| Blade Style | Sharp tower blade | Sharp tower blade |
| Small Parts | Easy to rinse fast | No small parts |
| Dishwasher | Top rack safe | Top rack safe |
Ninja BL660 Rating: 9/10
Ninja BN751 Rating: 8/10
You want to know if the extra cost is actually worth it.
Value for Money: Ninja BN751 vs BL660
The base model is often cheaper. It gives you huge power. If you only make big batches of party drinks, it is perfect. You get a strong motor without paying for fancy computer chips. It is a solid deal for basic tasks.
The upgraded version costs a bit more up front. But you get the smart programs and the extra travel cups. For daily smoothies and hands-off use, those extras are worth it. I feel like the newer one gives you much more utility.
| Feature | Ninja BN751 | Ninja BL660 |
| Upfront Cost | A bit higher | Usually much lower |
| Extra Gear | Two travel cups | Just the pitcher |
| Time Saved | High value to me | Takes more time |
| Best For | Daily fast use | Occasional big batches |
Ninja BN751 Rating: 8/10
Ninja BL660 Rating: 8/10
Choosing the right one comes down to how you plan to blend.

Conclusion
The older model is great for big frozen drinks. But the smart features on the newer one won me over entirely. I love pressing one button and getting a perfectly smooth drink. It costs a little more. But the daily time saved is incredible.
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