I have a Cyclops Fluid II. I read a lot of reviews before I bought, and it does seem like some of them must have a leakage problem, but there were so many other happy customers that I decided to go ahead.

I've only had it for 2 seasons now, but so far, no problems, and I love it. It's easy to hear movies and videos and stuff while riding, and it is nice to set it once and then just shift to change resistance.