I buy Ninja products all the time...this by far was the worse one I have ever bought.  Based on the success I have had in the past, I will be replacing it with another one.  Usually when I upgrade to my next Ninja product I pass may last one on to someone else, but this time I cannot wait to just throw it out.  The buttons stick.  Half the time the machine has a mind of it's own and restarts when I'm trying to turn it off.  I just find it a confusing ridiculous product.