Maybe I'm an alien or something, but I'm pretty excited about this. I'm excited for all the new gameplay possibilities this type of controller will allow for and I can't wait to try it. The fact it is going to be less expensive than the PS3/XB360 makes it a lot easier for me to justify the purchase as well.
I am kind of worried about the "sore arms factor", but in one of the impressions (I think it was 1UP), the staffer said that when playing the Metroid demo, he flailed his arms all over the place and they were getting very sore. However, as soon as he sat down and rested his arms on his legs like you normally would, it all "clicked" and it worked pretty well. If this is true, then it's not a big deal, but everyone who is worried about that has a right to be. When I play games, I like to sit back and relax. If I want exercise, I'll play DDR for an hour (and I do, twice a week, actually) but I'm not sure if I want it in all the games on the system.
Barring some sort of horrible disaster when I actually play it for the first time, I think I'm going to end up with this for new original games and either PS3/XB360 for standard games. Who am I kidding, I've got all 3 right now, I'm sure I'll end up with all 3 next time as well :/ My wallet weeps