If you want to maintain fitness while watching TV go with a trainer. I tried rollers last year and while the learning curve wasn't THAT great (it was a little sketchy) I started thinking about all those times after work when I'm mentally beat and physically drained. All I really want to do is veg out and spin for a while. With the rollers, I had to concentrate on what I was doing. No thought required on the trainer though. YMMV.