A friend of mine brought one over one day for me to tune up for him. I think it was a widowmaker or black widow or something like that. It had the spit grooves in the board. I thought it was a real nice call. I cut a reed for him and put a new cork in it and I thought it sounded real good all the way up and down the scale. They were selling a bunch at Cabelas last weekend I wish I would have taken the time to try some but I just did not. I did blow a kwackwacker and a couple of Betts calls, but missed the bgb calls.
That is my very limited experience with BGB calls.