My wife and I just heard about the Ninja Blender a couple days ago. I've heard in the past that the amount of power (watts) is one of the most important factors to look for when looking for a blender. This one has 100O watts of power, which is more than any of the blenders that I know about around this price level.
I actually used to use my parent's vitamix for a couple years a few years ago and that thing was the best blender ever. Earlier this year, we bought the Blendtec from Costco and loved it, but ended up returning it because it was just too expensive. So anyway, we had a coupon for Bed Bath and Beyond and we figured if the Ninja Blender sucked, then we could return it easily. I wasn't expecting all that much since it is only 1/4th the price of a Vitamix or Blendtec. I guess I shouldn't be comparing in the first place, but those are the only blenders that did not break and worked very well when making my frozen fruit smoothies. I have tried a number of cheaper blenders around the $50-$100 range, but they all were terrible.
Tonight is our first night using the Ninja blender and so far this thing is awesome!!!!! Seriously. It blended my frozen fruit smoothie in 30 seconds pretty well. It's not clumpy at all and we are even using cheap, narrow straws successfully. Now, when comparing to the blendtec and vitamix, it doesn't puree it quite as much, but definitely thoroughly. In fact, perhaps the blendtec and vitamix purees the fruit too much?
Cleaning is easy. For a quick cleanup, just rinse out, add 3/4th up full of warm/hot water with a drop of soap, then hit the pulse button a couple times. For a thorough cleaning, the blades come right out very easily and everything can be cleaned very easily. The pitcher (forgot if that is what it is actually called), blades, and lid are dishwasher safe.
It even has some cool features that I've never seen before. Locking lid and the pitcher locks in too. It won't run until both are locked in place, which is safe since the blades pull out when the lid comes off.
Now, when comparing to blendtec and vitamix again, you have to remember they are in different classes. Blendtec and Vitamix are commercial grade while the Ninja blender is not. When you look at the parts that actually wind/turn under the pitcher and on top of the base, the Blendtec and Vitamix use steel or at least metal; the Ninja Blender is using some kind of plastic. I don't know how long it will hold up, but I'm happy as long as it does for a couple years.
In short, this blender is better than any blender in this pricing range. Maybe it won't handle as much or last as long as the $400 blenders, but it does a heck of a job at a quarter of the cost.
Because this is only my first day using this blender, I may post an update to my review at a later date. If you don't see any updates, then assume everything is excellent.