The mag trainers get very hot after about 15 minutes, but you're not going to burn up anything (at least not in the short term). It will get extremely hot to the touch though - I have a burn on my arm from accidentally touching the roller too soon after a workout about two weeks ago.
The other option is fluid trainers, which seem to work pretty well. My oldest brother has one - pretty cool gizmo. Has a mountable lever to change the level of resistance on the fly. I actually don't have a cadence sensor - I'm considering one of the new Cat Eyes with the full readout functions.
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