Like monoplanes, biplanes are very variable in how they fly. The most ornery of the bunch are the detailed WWI scale models. They are draggy and often heavily loaded, and with a wing that tends to tip stall and a short fuselage that doesn't forgive ground handling errors they can really test your abilities. Then there are the classic sport biplanes like the Sig Hog and the Balsa USA Phaeton II. I have an original Phaeton and it's easier to fly well than my Cub is.