I'll go first. Out of the main ones, MES, MNQ, M2K, and MYM, I have pretty much only traded MNQ. Not much of a reason, I'm afraid. I was told that was the one to trade. I want to try to set aside some time for paper trading the Micros when we have some major projects completed and I am not quite so busy. Meanwhile I wanted to soak up some of the collective wisdom of the forum.