First generation Dynafit Low Tech, Speed Superlight toepieces:
If you are buying used, look for later versions of the toepiece, with more material around the mounting holes. These are usually dark green, 1 yellow/1 blue, 1 red/1 green, or yellow (Fischer version).
Dynafit Low Tech Race (2.0) Heelpiece:
Dynafit RC1/Pierre Gignoux Pack Ultimate Binding.
Fischer Alp Attack:
First Generation Scarpa Alien:
Here, I am only referring to the very early versions of the boot with a wrap liner instead of the later sock liner. The skeleton-like rear levers were weak. Later versions of the boot with the sock liner had stronger levers. Make sure whoever owned the boot before you had the levers upgraded to the stronger ones!
Any other race gear to be avoided?