Well, clamping is either good or it isn't.
If a seatpost clamp adjusts easily and precisely, and holds the saddle securely, that's good.
If it doesn't, that's bad.
There are many clamp designs- one bolt, two bolt, front to back, side to side, toothed clamps, smooth clamps... the varieties are endless. There isn't one clamp design that's widely considered to be the best. It's pretty much a post by post thing...
Lots of folks swear by Thomsons. I don't really have a favorite. If the post is light and strong and holds my saddle securely in the position I want it, I'm happy.
Last edited by VT to CA; 01-02-08 at 05:13 AM.