It's great, I got it for Skyrim initially after I saw the YouTube video where the guy has hooked up his Kinect to the PC. I'm not bothered about the motion sensing but he was using voice control as well.
I tried a few out but Voiceattack was by far the best, and only $8 to register too!
It has its limitations, anything you need available in a split second you need to keep on the keyboard but it's great for everything else. I could get dual heal, dual summon, heal/fire spell or any other combination programmed in and no need for any farting about with the keys.
And it's great for STo, the whole 'make it so', 'emergency shields' etc thing is brilliant