This machine has absolutely no resistance whatsoever. Have no idea why it is called a "Cardio" Mini Cycle.
As some of the others have mentioned, it is not stable on tile, wood or even carpet. Very hard to actually get a comfortable position to use it. Total waste of money. Particularly as they charge you a 15% restocking fee to return it. Not impressed at all.
Works just fine, the only problem is that it slides on my floors. It needs something to attach to the bottom so that it doesn't move. I found myself pulling it back to me with my feet every minute or so. Annoying. I think it might work best on carpet, my floors are hardwood and linoleum. As for the work out on your legs, it's easy to sit in front of the T.V cycling and forget your working out. That I really like!
For those who want a lower leg workout or arm workout and have trouble with a regular bike Marcy is a popular mini-cycle. Talk to your doctor for permission to use this apparatus. Also do put an exercise mat underneath it.