Does anyone have any experience with these on race-day.
e.g. Puncture during a RR or Crit; messed up wheel swap; etc/
Take the advice of a veteran of 20 years of amateur racing... Don't do anything "fancy" on your race bike. Initially you may think it would be "fun" or "cool", but the reality is that once you are racing, the last thing you want is a mechanical failure. Time Trial and Tri bikes are a bit different story. The cycling in an even like that is just flat out constant speed. But in a road race or criterium, your bike gets a lot more use/abuse. Things are more likely to come loose or out of adjustment.