I have no bike control skills whatsoever, so these rollers were the perfect solution for my indoor training.
I'll continue posting the link to Dr Will's review of these since I think it's probably the best unbiased review of these as any I've ever read.
http://www.bikeforums.net/showthread.php?470210

The variable magnetic resistance setting is also great.. you can set between 0-3, 0 being minimal, 3 probably being close to Cat1-2 training.