I have to disagree with what RdDezert said about fluid trainers. We have the Kurt Kinetic and really love it. I have not used any of the other types of trainers, but I can tell you that as someone who easily has knee pain, a properly set up bike on the Kurt doesn't aggravate them and I have been able to spin at 130+ RPMs (I have a cadence sensor) and not in the granny gears either![]()
I suppose if you had a fixed gear bike in the trainer then maybe you wouldn't be able to spin as well.
As far as leaking goes, the newer ones are completely sealed. Overheating - they do get hot. But not like they'll cause a fire. I ride with a fan. The fan actually produces much more noise than the trainer.
Veronica