Based on the gyms I've been to and the research I've done (decided for now just to get a trainer for my road bike instead), here's my 2cents:

Johnny G spinners--the newest models with the infinite adjustments for the seat (height and forward/back) are the best. You might want to change out the saddle, though, because it's a bit wide IMO (they do make more ergonomic ones you can swap out). The handlebars aren't bad, and with the new seat arrangement, you get a better fit than the discrete peg style adjustments of the older models. They last pretty well, particularly if you spray them down with a mild cleaner (like SimpleGreen), and pull the handlebar and seat posts up all the way to dry off--sweat is corrosive.

Reebok bikes--resistance is a lever not a knob, and it wears out very easily. The resistance might start to "catch" at certain places, making it impossible to get a smooth pedal stroke. Also has poor seat adjustment issues as the old Spinners.

LeMond--my current gym doesn't have the newest ones, which I think have more comfortable aerobars, but I'm not impressed. The seats are horrible--very high in the tailbone area and slippery. Infinite adjustments, which is good. But very high angle upward of the handlebars--like old SportTrak spinners. Kind of awkward, not much like a road bike feel at all. Plus, I feel that it's easy to outspin the flywheel in a sprinting effort...like with some of the poor mag trainers. Not the best 'feel' IMO.

I'd buy a Spinner for sure. But there are obviously brands I haven't tried. I think you can get replacement parts pretty easily from them.