I posted this in the other thread:
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Ease of use. No need to attach or detach bike. No need to tighten anything. You just hop on and ride.
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No need for a dedicated wheel. Less wear on your rear tire/wheel.
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It looks cool, especially if your doing roller tricks, like no hands, one legged, no hands and one legged, out of saddle, out of saddle with no hands, bunny hop and riding away, track stands, etc.
I’m skeptical of the bike handling, learning to hold a line, smoothing out pedal stroke claims. Riding rollers may make you a better bike handler than riding a trainer, but I don’t see enough of a benefit if already regularly ride in a group. It may make you a bit more comfortable on your bike, adn that might translate to other scenarios.