I am not a plumber... the plumbers whom I recommend would not go out of their way to complain if there was no reason to complain in the first place.Unfortunately I have to disagree, a fair number don't - the big online wholesalers do, i.e. the large web based bods are the worst but a lot of the more specific retailers all carry branded mainstream manufacturers hardware.
The key is price and brand - don't buy cheap weird sounding named hardware without reviewing it and ideally have somewhere it can be taken it back to.