Union does have canting on several models. Yes burton reflex bindings do come with 4 hole discs, there is a second set of discs that can be ordered if you need edge to edge alignment instead of nose tail. Reliability has bee good on the vita and cartel. The vita feel stiffer in the hb than the cartel, in practice it's probably not noticeable. They share the same baseplate iirc. Neither is overly stiff and probably on par with the 390.