The problem with using Mezon 90/95 (Non Light or Light, BEC version or OPTO version) is that it could work fine for long (or short) time and then BANG - it is fried FET's, like it was on mine. I had about 200-250 flights on my Mezon 90 (with BEC) when it got two fried FET's as shown in previous photos above. Then I mounted a new Mezon 90 again in the plane and it has worked fine during 2017 and 2018 seasons, probably about 500 flights. But You never know how long it will work like that. If You get a fried ESC in an unfavourable position over the flying field it may cause trouble to land in a normal way on runway. Landing out in rough terrain with our rather fragile F3A planes can be an expensive thing. And it is not for sure one is so lucky the ESC just fries, there is also the danger of a real fire in the plane when the ESC goes up in smoke. Then it can be really expensive flight.
/Bo