I have Northern BTS, Frank (CB), I got from BHB last year. I also have a Hypo-Lavendar Corn I bought from them as well (4 years ago).
Both are doing great and I have had good experiences with them. Brian encouraged me to stay in reptiles after my kidney transplant. The doctors were afraid (because of immune suppression), but Brian pointed out that he has a friend who breeds snakes and had a transplant as well. That gave me confidence to continue with my pets, but, of course, be smart (hand washing, hand washing, hand washing!).
I have also had the BHB crew answer questions on animals they breed, but that I hadn't purchased from them. Overall, a very good experience.
My BTS, who is almost 2 now and full grown, lives in a 6X2' Boaphile tank. It's 17.5 inches high, not because he cares, but because he needs UVB, and I needed room for the light fixtures. All my other animals, who are nocturnal, and do not require UVB, are in 12 inch high 6X2' boaphile tanks.
I had Frank in a 5X2' previous and he was fine. However, they do like to move around a lot and will use their warm and cool zones. The more space the better, even if not required.
Good luck!