I have built a Nitro Planes P-51 (Miss America) and a nitroplanes Ultimate Biplane. I have had great luck with both. The Mustang was exactly like the Hanger 9 one (it actually had a the instruction booklet from the Hanger 9 Mustang included with it), and the Ultimate was great quality. I built the Mustang and flew it a couple of times, but eventually sold it because I just didn't fly it that much. I never had any problems out of it though. The Ultimate Biplane I have however is the best airplane I have flown. I probably have over 200 flights on it now, and it is great. I completely recovered it after a summer of flying it. I didn't even rebuild anything while I had the covering off. It all looked good to me. The hardware and the instruction manual were the only things that I found sub par. I would definitely purchase from them again. I had very little contact with the company however, so I can't speak to their customer service. All I know is I ordered them from the website, and a few days later they arrived. Good luck with your conversion, and post some pics if you do start one!