I own a BP25 built in '98. To me there is no sound to it at all, it adds or takes nothing from what is fed through it. Current amp 4B3 and before that had a Classe C-201. The polarity/invert phase switch is a big plus to have. Here's one review.
Bryston Preamps - What do they sound like?
I stumbled across two early 2000 vintage MINT Bryston preamps for good prices. What do Bryston preamps sound like? Are they ruthlessly transparent as would be expected for SS, or are they a warmer, more tube-ish sound? Not many reviews out there on Bryston preamps ...