I bought this for my wife and I for Christmas. We'd had the NB600 for a couple of years and were looking for a replacement. My research piqued my interest in the NB900 so I decided to give it a try. I learned a lot from the NB600 (especially about unintended abuse). While I have no complaints about the NB600 I really enjoy the product of the NB900...it is a much smoother drink. The 900 needs less time to do the job (ie. faster) and noted already really blends ingredients much more thoroughly. I have been really impressed with Nutribullet 900 and am quite satisfied. I highly recommend it!
I bought my NutriBullet back in July and just love it. Love the way it "masks" the flavors of some of the veggies that aren't my favorite, but use anyway. Everything tastes just great with it.
This is my second one because the first one rusted and cannot use it as rust leaches into the unit and the smoothies taste like rust. Ive had the second one about 5 months now and now its starting to show signs of rust.
I am happy with the unit but have a major complaint. The blade attachment needs to be secured to the container with a great amount of pressure or it will leak and create a mess. When you do tighten it is very difficult to loosen.