Only flown the 450. Feels like a tractor, like the Pawnee it has a lot of oomph and a lot of drag. Never flew a stock one but my buddy has flown the 225, 275, 300, 450, 600hp ones said he felt the 275 was the sweet spot; lighter and more balanced. Dunno what the weight difference is from the Pratt to the smaller radials. There is a fella here in Phx that will do training in a 450hp one if you catch him in the right mood.