I 've had 5 flights on mine and all were fine. Well sort of. I run my engines inverted. I have 3 engines inverted. two are OS 1.08s and one is a BGX 3500. The main thing here is to lower that tank at or below the carb line or your going to have problems. I decided to leave it on the P-47 to see how it would run and it was not good.
So I did some carving and such and lowered the tank and all was fine and ran like a top.
I'm using the standard retracts and Kavan wheels. Reason for Kavans is the hard plastic allows the plane to slide when you run out of runway without that bad wheel hopping which in turn rip out the gear.
I also slopped a lot of epoxy inside the retract mounts. I do this on all my planes and those babys hold up great. Nice plane