No need for apologies
Jack .
I agree that the camera manufacturers own products are made to match with the bodies perfectly but at a price. I have owned Nikon units as well and to be honest, I think the build quality of the after
market products is very close (can`t comment on the electronics).
My advice would be that if you can afford the camera manufacturers product then go for it as you won`t find better but if price is a consideration, the after
market products are fine , just don`t buy a no name chinese knock off.