I ended up calling Darrell direct and chatting with him for about 30 minutes. Very nice guy, listening to him talk made me recall the 7 years I lived in the Atlanta area. Hoping to get back down that way when I retire one day.
Ordered a second call as a gift for my brother and found some info out for the guys at work. One thing to note, as we talked he told me that he has a new bore size on his calls he is now using that produces an even better sound then the older models. I am not good enough of a caller to probably notice but just a heads up. Says the calls produced in the last 2 months or so have the new size.
Glad I called, got a little tutorial on calling and got to listen to some great crow hunting stories.