I find the referenced original price of the Diafun interesting. I believe it to be accurate as I remember BVD doing a "$500 roof binocular" shoot out article where, IIRC, the Diafun was included. At that price point and considering their performance and competition at the time I would agree that they were overpriced. The Conquest 8x30 that followed/replaced it eventually was infinitely better optically and with the more conventional, and preferable IMO, eyecups. I remember when Zeiss has the Conquest 8x30s regularly sold at $400 with demo used models between $300-$350.
Then the prices skyrocketed over subsequent years and the last I noticed they were going for $600.
As for the comments about BVD I would agree that some controversy arose at times over a variety of issues. I, personally, give credit where it is due though. It was that site that I found fascinating, informative and a good reference. I don't remember reading any other site, at the time, that provided as much info about so many models. Mr. Ingraham also has the ability to relate a variety of optical concepts to the average person. I, for one, felt educated after reading the reviews and articles on the site.
In addition, if you actually met the man you might be surprised. He certainly wasn't what I expected the first time I met him. He is intelligent and soft spoken. He doesn't have the chip on his shoulder that I found with some other optics reps that I have had the chance to meet. He doesn't come off as the salesman when you speak to him. Quite the opposite actually. He just seems like another one of us who was skilled and lucky enough to turn his hobby/passion into a profession.