Depends on what you mean by a good workout. I have a set of the cheap nashbar rollers that I got for around a hundred bucks. I always thought they gave me a good enough workout since I just ride inside over the winter to keep from getting too fat and don't do intervals or anything like that. I just get on and spin for an hour or so while I'm watching TV. A few years ago I picked up a set of used insideRide rollers, and while they're easier to ride than the nashbar rollers, I don't notice that I get a better workout on one or the other. I suppose I could crank up the resistance and get a harder workout on the InsideRide rollers, but I don't workout that way over the winter anyway.