Isokinetics Magnetic Pedal Exerciser
I really like this for my purpose. It sits to the right of my desk chair, on the carpet.  So when I'm on the phone or reading, I can pedal instead of just sitting like a statue.  I can pedal longer than when I first started too.  It's very quiet and I can adjust the tension.  I solved the sliding of the thing by putting the curly side of self adhesive velcro onto its feet, and since it sits on carpet it stays put.  I thought it would be really cheap, but for what I do with it, its really great.  hope this helps.
Rating: 5 stars