Those types of things end up being poor quality. Because of that, most people tend not to use it. If you really want a bike trainer, I'd just use a bike you already have and put it on a quality trainer like these.
http://www.cycleops.com/products/trainers.htmlI picked mine up for ~$100 on craigslist from someone who barely used it.
Honestly, you're better off doing your own interval cardio training if want something during TV. Body weight would even work. Watch TV, then during a commercial break, do as many situps/pushups/etc as you can without a break, or ride the bike at high intensity. (This is AKA AMRAP, as many reps as possible). The key is HIGH intensity, don't baby it since it's only 2 minutes. As you get better, you can stretch out that 2 minutes.
Or you can do a tabata workout while watching TV, though I doubt you'll even be able to concentrate on TV after the 2nd round. I've done these with pushups, situps, air squats, weights, box jumps, etc (just pick one exercise BTW). And yes, you can get a full workout in 4 minutes, wherein only 2/3 of the time is actual effort. Some workouts have left their mark on me for days, but the benefits did appear.
http://tabatatraining.org/?p=18Just be mindful of heart rate with these types of exercise. Your HR will max, so you need to make sure you can handle it. But the point here is training efficiency. Instead of spending what's called 'garbage miles/minutes' training, you spend less time training harder. Granted, any exercise is better than none at all in the end.
