I first flew 4*40 and later flew a 4*60, I flew a Contender 40 then and Contender 60, and I flew a Sig Kougar and later King Cobra. The 60 versions are good fliers, easier to see, but lack spirit, quickness, and mobility that I like when flying. The difference really shows between the Kougar and King Cobra. One is a sport plane and the other is a 1970's early 80's pattern plane. That best describes the difference between all scaled up versions of the same plane.