Bought one. Too expensive but I just wanted to play games what feels to me the right way. Can't imagine playing with a plain old Sixaxxis now (I kept mine as emergency backups and for when the kids want to play each other). Over time I'll buy a few more until I have four most likely.
Pretty much every game feels way better now, particularly games like Motorstorm, Burnout Paradise, etc.
Try to be reasonable... its easier than you think...