I've owned a 160hp RV-6 with a fixed pitch propeller for coming up on four years. It really is a great airplane, but today, a friend let me fly his 180 hp RV-6 with a constant speed propeller. WOW!! That could really get addicting fast. His plane has all EFIS for flight information. I found myself searching for things, but after 20 minutes or so, it was starting to work for me. Both airplanes are the same in flight except for the performance difference.