Before you splash out, have you made sure you have reduced your drag in every other way? Like helmet choice, tightness of clothing, body position etc? I can't afford nice deep rims so have tried to eliminate drag elsewhere first. Maybe watch all the Win Tunnel videos with a pinch of salt. Looks like even the correct shoe covers could save seconds.
Before you splash out, have you made sure you have reduced your drag in every other way? Like helmet choice, tightness of clothing, body position etc? I can't afford nice deep rims so have tried to eliminate drag elsewhere first. Maybe watch all the Win Tunnel videos with a pinch of salt. Looks like even the correct shoe covers could save seconds.