That depends on which BG products that you are talking about. Some of their items are the best in their catagory, while other items are merely average.
I like their air intake cleaner. Best thing yet for just melting away the gunk out of a throttle body. A close second place goes to K&W brand that I got at NAPA.
BG does some sponsorship for my buddy's race car, so we do use some of their products frequently.
Pretty strong stuff, has quite a kick to it. Can't say I'd drink it again. But I'll definetely buy more for my car next time I'm at the dealer (I get a discount on it, though).
BG44K worked for me when nothing else seemed to. I actually ran the stuff at double strength (2 cans) and It cleaned out my injectors something fierce. Before, even with Techron, etc., my car was still stumbling. Afterwards- smooth as silk.