I got one for $30 off Craigs List. It's fun, and I like it but sometimes I wonder if I'm wasting my time. I've had it for 3 weeks, using it about 5x a week. I FEEL better, but I don't know if it's really burning any fat (I wasn't eating right, but I am now). I don't really get out of breath and I'm never sore (although I do warm up/cool down/stretch).
I have a 13 m/o so I need a way to work out at home. Couln't afford a treadmill. I also have WATP on DVD, but I like listening to my MP3 player while I work out. Music is a HUGE motivator for me.