Our field has a couple of them flying around, including mine with the first gen ZDZ50's. Another strong performing one has a DA50 in it and I am very impressed. IMHO if I were to do it again, and I might, I would go with the new ZDZ50NG. I saw this engine in person in a Hangar 9 Cap 232 80" and it tached ~500 rpm more than mine with the same prop (Menz 22x8) and muffler (BCM Pitts w/ends cut), no BS. I'm seeing what I can do to replace my 50 with the NG because I think it is that much better. Good luck and no matter what you go with, have fun!