BFG was one of many manufactures that made nVidia cards from their reference design. Often, they would improve on the design with a better HSF and higher quality RAM so the card could be overclocked out of the box.
Kinda sad to see them go. They've always provided good warranty support.
I was very impressed with their warranty some years back. My 7900 went bad on my and much to my surprise they sent out an 8800 to replace it. That card served me well till it's replacement 6 months back for an ATI 5770. If nvidia was an option at the time I would have got it from BFG without a doubt. Just that at that point in time the ATI was a much better option.
The bigger the theory the better.