Oh yeah, I'm having trouble with my J-50BC.
I've got one in my Jackson (first one) and it's perfectly fine but my 2nd one (with Charvel cover) is in my BC Rich and makes a horrible loud buzzing sound when you're not touching the strings. Even when you put your hand on them, it's still a faint hum. All the wires are soldered securely but I dno how to stop it. I actually think the other one did that in that guitar too so I think it might have something to do with another wire but I swear it didn't do it when the BC Rich stock pickup was in it.
Oh well, I hardly play it anymore. When you have a £900 Jackson Stars, you kinda realise how bad the condition of the BC Rich is in!!! The neck and strings feel disgusting.