I used to have one. Didn't use it much though. It was nice when I used it though. Beats spending 45 bucks/month on a gym membership + time and gas spent to get to the gym and back. So it takes about an hour to get a 30 minute workout at a gym. You really don't need a bowflex or gym membership as you can do everything you need to with a exercise bike and some free weights and this:
http://bodylastics.com/
Don't overdo it with the weights and go too fast and get wrist and hand tendinitis like I did!