Having been building rc planes since the late 60s ( anyone remember Heathkit radios?) long before arfs came along, and witnessed the steady progress of these arfs, I have rated mine based on how many mods and additions it took to bring then closer in quality to a good kit built airplane. The GP PW Extra 300 is my latest arf and, far and away, is the best built and most complete arf that I have tried to date. The mods that I did make were minor and mostly because of personal preference more than necessity. I expect to have more and more pleasant experience's with arfs as they continue to get better and better just hope we don't see building become a lost art.