The top the rubber inside is constantly coming off. Plus it's difficult to unscrew, since as it spinning it loosens. It has to be tight.

So glad I finally bought it! Works as advertised! Pulverizes everything :)

It makes great smoothies! Works very well! Easy to clean!

I'm on my second one, the 900. Still use the 600 for back-up.

We did a science fair project and this was in the lead for least chunky.

The best thing in my kitchen right now! Great customer service too!

I am so glad my daughter in law bought this for me.

I brought this over a year ago I love .its does everything it said it would do . thank you

I use it every single day and love it! I'm able to get in lots of fruits and veggies into my diet

I love how it blends so thoroughly, but the cups are a bit large for small hands.