I have lots of hours in a model I and II. I cant see how one could possibly say they flew terrible. I think it is one of the more enjoyable planes I have flown to date! Yes it has some adverse yaw but nothing close to terrible. If all you have ever flown was a spam can with rudder / aileron interconnects, then I can see it being an issue to transition, but a few hours and all should be sorted out.

Floats wheels and skis I think the early model Avids and kitfoxes are about as much fun as you can have with your clothes on.