I've only been cycling about 9 months but the snow started falling and after about 2 weeks of sitting on my butt i looked at trainers. when I saw the rollers I knew those were for me. I'm not very balanced and my bike is new so I knew it would be hard. Anyway, just got them today and threw them between a door jam. Took about 30 minutes but I finally managed to keep of the walls for a couple of minutes. There was a lot of resistance but I moved the front drum and now there is less. But If you get one make sure you can adjust in small increments. my bike is really in between two drum positions so it's not a perfect fit.
All in all it was hard but a much more fun workout than the trainer I tried last week. I can feel tension in my core and arms from the balancing act. like Filtersweep said I like the way the rollers don't mess with my frame. I'm not using clipless and I think starting in clipless might be really hard for some people; I'll add clipless pedals after I've gotten better at balancing.

Anyone have a history lesson on rollers? I have a feeling they've been a round a long time b/c of their simple design but I'd never heard of them until a few weeks ago. They look like something my grandfather would have had.