I have the Kyosho P40. It is a very good flyer. It was a war finding retracts for it and the Kyosho ones that finally came available were a real mess. I would suggest using the fixed gear for this. But it's a good flyer.

A friend has the H9 Warhawk. It's had the OEM retracts in it for the last year or so. That is an excellent flying airplane, and the gear has stood up well. I plan to get one if the Kyosho every buys the farm. On that topic............

Flying it a few weeks back, the stab/elevator fluttered in flight. Turns out the LE had failed (1. in the uploaded image). It was lousy wood and failed right where the excellent LE reinforcement ended spanwise. Had the ARF worker any experience he'd have rejected the LE wood and found some decently hard stock. And the solid elevator (4. in the image) being the heaviest part of the tail crushed itself underneath the horn. I've reinforced the works (last picture) and have flown it since. It's a good flyer.

I've got the H9 P47 and it's retracts seemed good enough that I'm putting together the F4U. My field isn't exactly smooth. I've not flown my buddies H9 Warhawk, but his 8 year old boy has. So I figure it flies a good as my P47. And would be an excellent choice if the need ever arises.