Stay as far away from them as you can. Took my aircraft in Oct 2017 to have a Garmin G5 HSI installed. After he kept my plane for 5 months I decided to get it out of his hands. He broke my co pilot seat frame in half, broke pilot side window, my gear would no longer come up, landing lights would no longer turn on, turn on map light and electric trim breaker would pop, put flaps down and my JPI would turn off, told me he had my S-Tec 50 reprogrammed for the G5 and later I found the factory seal was never broken on it since 2005. The G5 was wired completely wrong. My com/nav 2 no longer works. It has taken me 7 months to fix all his work. He broke the fuel line between the firewall and my fuel flow instrument in the panel. I had gas leaking inside when I took the plane away from him. Thousands of dollars later I now have it all back working.