I bought one of these some years ago, after having watched a demo at a quilt show. Mine is a previous incarnation - simply called Quilt Cut. Looking at the current version, I'm not sure what's different. I put mine back in its box and I'm too lazy to get it out.
Don't get me wrong, the thing DOES work well, and is accurate if done properly, but I've found it to be a lot more trouble and way more time consuming than just plain old rotary cutting with a ruler.
If you want my old one, I'll sell it to you cheap. *G*
(please forgive me if that last line is inappropriate here - I've got an edit button, just let me know.)