Thomson is one reason why I advocate so hard for high-end frames to be designed to take round seatposts. I have never had a Thomson seatpost tilt or slip on me.
Same for accepting standard stems. Their X4 stem was used by the AUS and GB teams by the sprinters. It's unmatched for strength. My only gripe is that it comes on only 0 and 10 degrees.
Perkins in the London Olympics riding a Thomson X4:
