"I have used many of them. My favorite is...Kinetics Fluid trainer. Bullet proof. Smooth. Road like feel. Built to last. Tough as Tyler Hamilton. Leak proof. Get the 'road machine, model with the larger fly wheel if you can afford a few extra dollars. You can buy them direct from Kurt kinetic. Google search for the web site...or check ebay."
I second oneradtec. kurt kinetic is the bomb. the fluid system is sealed and has a magnetic drive. I've gone through 3 winters with mine with no problems. and make sure you get the extra heavy flywheel. 20 mph on the road machine feels like 20mph on the road. you stop pedaling, it coasts, just like on the road. accept no substitute.