I have used trainers and rollers. Both are boring but rollers less so due to the concentration necessary*... although I never tried watching TV while riding, and that is not really doable on rollers.
The last time I was on my rollers (a few weeks ago) I had my iPod on and I was planning on doing an easy 30 minutes... I figured about five or six songs... but I wound up hammering and doing intervals during the chorus and stuff for about an hour and a half.
My wife has also taken up riding the rollers and we are probably going to get another set so we can roll together.
Trainers are very boring but you can get the most kickass workout of you do it right.
*the concentration necessary for rollers is basically to not fall (as if you were riding) and to keep your vision focused well ahead of you - I put a fan 10 feet in front to cool me down and give me something to look at.