Rollers

Digging up this old thread as I'm thinking of getting one or the other of these and don't know which...

Does a turbo not require you to balance / use your core at all? I can see the benefits of rollers from this perspective definitely, but surely without any resistance, you're just gonna be pedalling at about 10000rpm for however long you choose to train? I'm a roadie rather than a track cyclist by the way...

Also, any reccommendations of what to buy (regarding both rollers and a TT)?

me again... so, having perused the bike radar forum for one of the first times, i'm hearing the cycleops aluminium rollers are pretty good, anyone use these?

also, how much of difference to resistance does changing gear make?