It's nice to hear from a person who knew Dave. The family and myself after his passing tried to get a hold of as many people as we could to let them know (and this was not a small task. His memorial had 500 plus people who attended), but many times it was quite impossible, as many people changed phone numbers, addresses, etc. To this day, I still receive phone calls from old customers who had no idea he passed away and are surprised that his approach to audio and his technology has continued to live on. Dave was such a larger than life person that nobody dreamed his life would end so soon.
People did love his BGTs and he sold quite a few of them according to store records along with his earlier versions of single driver speakers. Also, the BGTs were rectangular boxes wrapped in grill cloth with wooden tops and bottoms. If your speakers are pentagonal in shape, they are a different model after the BGTs, which were very good as well.
As yourself, we too spent many hours with Dave in his listening sessions and testing sessions and we continue to do these listening sessions, as they are the most effective way to continue to improve our product. As with Dave, our products continue to improve and is a constant search for perfection.