-
I have my old mtb shoes still which are ATACs, my old road shoes are SPD-SL and all my new shoes are Speedplay/midfoot. Probably some SPDs kicking about in Oz too. But I don't use any of the old ones - I can barely remember to take shoes as it is so taking the wrong pair to a race is more problematic than worrying about 2W.
If you do get them defo fuck the Campag and Keos off spits
Given that you need some pedals anyway, that's not CRAZY money but it is another pedal system you have to fart about with, have spares for, forget your shoes for, etc.