This is my 2nd NutriBullet. The motor seems more powerful than the original model, but there has been a constant faint odor from the motor whenever operating that wasn't noticeable with the older unit. I hope that this is not indicative of a future problem. Otherwise, it has performed flawlessly and the accessories from the prior model work with this current one. I use this at least once a day (for nutritional shakes) and I'm totally satisfied with the NutriBullet Pro 900.
Bought it a month ago and problems - the little plastic "bumpers" at the bottom of the bottom part came loose and had to re-insert them which shouldn't be necessary - plus the seal between the "cup" and "blade" is kind of loose and you need to be careful to make sure you give it an extra twist. Works fine but these little problems should not happen. This is our fourth device - they only last about a year.
DO NOT BUY THE NUTRIBULLET!! I have had mine for one year now, it has been problematic the entire time. Three months in I had to have the blade replaced, due to the rubber part that was already starting to disintegrate. Both cups have dramatically discoloured and the little tabs have cracked off. The motor frequently produces a strange smell. NOT RECOMMENDED!