A lot of issues people have with rollers has to do with the position of the front roller. The bike gets really twitchy if you have that front roller too far ahead of the front axle. Ideally, the front axle should be right over the top of the front roller.
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Cat 2 Track, Cat 3 Road.
"If you’re new enough [to racing] that you would ask such question, then i would hazard a guess that if you just made up a workout that sounded hard to do, and did it, you’d probably get faster." --
the tiniest sprinter