Something is brewing here ... hehehe ... now now ... play nice! Anyways, WM planes can be trusted. I have not heard of one with a hinge failure yet.
Also, the Mach II is a very light plane, there is no much load exerted on that plane. Its not like some 33% acrobatic plane. Also, we must realise that the control surfaces on such planes do not have a big surface area and are not running on maximum throw. It will be fine ... alternatively pray hard before each flight!