AND, if you start with a trainer, floats make it MORE aerobatic inverted. I have put floats on Lazy Bees, Super Stik, Fun Fly Planes, a Telemaster, and SPAD coke-sign and drainpipe models and they all fly well with floats...REMEMBER: I always use lightweight styrofoam-core floats.
Built-up plywood floats look good but they are heavy. Blow-molded plastic floats are not high on my admired list (somewhere near BinLaden). I once won a funFly and my prize was a set of blow molded floats. I asked if second place was TWO pairs of blow-molded floats.......