I bought this product about in April and has been very useful. As long as you follow the instruction, it works very well. Nice smoothie blend and a must have if you are a smoothie enthusiast. I have has a couple of times that the smoothie tried to come out in the process. Found out I backed it too full. On one or two occasions too I have had to struggle to open it due to closing it too tight or the sweat on the jar due to the frozen fruits used.
It's a great smoothie maker--quick, efficient and easy clean up. The reason I didn't give it Five Stars is that the first one I purchased only lasted 5 months. I'm still on first month of the second one I purchased, so the jury is still out on how long they last--longer than 5 months, I hope.
I bought this to replace the 600 watt version my wife bought a couple years ago. One of the reasons I bought it was because it came with two larger cups. I would've given it 5 stars, but i know the tabs on the cups wear out eventually, and I'll have to get new ones. I use it at least once a day, sometimes more.