Glad to see someone else say this - I also use a 1up. I had a fluid resistance trainer that never really worked (no resistance, just rough). I find the gears to be plenty resistance and the 1up is so much smoother.
Can't for the life of me figure out what's in it to make it so expensive, though. But, worth the money since it works so well. It also handles different-sized wheel pretty darned good.