Other than a severe lightening of the wallet, not much, really, as long as you get one of the 8pc grouppos (Brifters, Cranks, F&R Der, Brakes, Cassette, Chain, Cables, BB) Just remember your rear freehub will need to be replaced for the Campy cassette.
BTW... only Campagnolo has "Grouppos" all others are "Groups"
A forum community dedicated to Road Bike owners and enthusiasts. Come join the discussion about bike parts, components, deals, performance, modifications, classifieds, troubleshooting, maintenance, and more!