I replaced my Kontronik unit ( LV 80) in a T Rex 550 with the Hobbywing unit. The unit works smoothly and is easy to programe either with the program box or via PC. Super slow start up for scale Heli and hardly gets warm on 6s set up. This is a high end unit without the high end price tag. I will buy another one when back in stock in EU. (Take note HK)