my opinion; forget the rollers. They are ok as a training aid, but then again so is riding outside lots. and not as Booooring. I picked some outof the garbage and used them for a winter. Gave 'em away because id rather be cold then bored silly. A FG alone will increase endurance and improve pedaling technique; its all in how you use it.

anyhoooo, if you're bent on them, you cant use them on carpet because a) the roller will drag on the carpet (not much clearance) wearing it out, and rubber dust will spew all over the carpet. Just getting a sheed of plywood the size of the rollers will resolve this.

Also, the plastic drums seem to develop channels in the center (they wear).