My friend has one, and she is a great cook. She says it does what they say it will do, but...
...in order to really get your money's worth, you have to have it out on your counter or in a place where it is very accessible or you won't use it.
Kind of like a Food Saver vacuum system. I love mine and use it a lot, but when I don't have it out, I don't use it nearly as much.
Michael