I've worn my VFF KSOs for
I've worn my VFF KSOs for three of my sprint tris and my TrekSports for one. I prefer the KSOs over the TrekSports for ground feel, but the KSOs do sometimes rub my feet raw in one spot, which makes longer sockless runs the occasional race against blisters. I'll be wearing KSOs during the Honolulu Olympic May 15th.
These are the only two minimalist shoes I own. They work fine, but I bet the toe sockets slow my T2 down. Now, that doesn't really bother me because I'm not nearly quick enough for that extra five or ten seconds to matter. My VFFs are not keeping me off the podium, the guys riding 25mph and running with a 6min/mi pace are.
Some day in the future I'll be looking in to other minimalist shoes so I don't just wear the VFFs all the time, and those unknown shoes might become race shoes if they are faster to slip on at T2.
So I wear what I've got and while I don't know that they are ideal, I really like running in the VFF KSOs. Someday I'll also get myself a pair of Bikilas, which might become the race shoe.