I had great service, a fair price, and on time with Stark Avionics in early 2020. GTN 650xi, dual G5, GMA 345, GNC 255A, GTX 345, GFC 500, new TC, new VSI, and a couple odds and ends. They were in Columbus, GA then. In Panama City, FL (KECP) now. Different employees, but I'd expect the same service.