The Wah Report

I've seen a lot of both of these this year. I've got both, but I don't use them for racing unless it's cold enough to justify the shoe covers. My opinion on shoe covers is that they keep your feet warm and may be useful in a TT to shave .00001 seconds off your time. But, when it is 70+ and you are racing a crit or a road race what's the point? I use mine on my commute to work, but it's 40 degrees and they keep my feet warm. On the way home, when it is 50 degrees I take them off.
Excel Sports seems to share my opinion as well

"The Slipstream is designed to wear over your cycling shoes in both cool weather and anytime you want an aerodynamic advantage."

Cool weather and aerodynamic advantage... again if it is cold or if you are doing a TT.

PowerTaps seem to be the rage as well. Maybe because Floyd used one at last year's tour. Last year I didn't see that many during races, now they are everywhere. I use mine for training, but don't see the need to haul the extra weight around during a race. If you got the $$$ for a PowerTap SL 2.4 wireless or the extra $$$$ spanky SRM then maybe. It might be cool to look at the data after the race, but again I don't see the point.

If you like to rock both, I'm cool with it but maybe I'm old school.