If you're looking for 50s-60s rock tone, the Streamliner 900 is a def ++. It is a dark beast that can be tamed by spending some time on the Eq. Overall, pretty easy to dial in a nice fat tubey tone.
Think Them Crooked Vultures and you get an idea
My style would be in the ball park of The Bronx mets The Sword and it nails what I'm looking for. However, it does not do modern highs/mids that you might find in some clean bass tones Karnivool tracks and such.
Also, GB customer service is WAY above the rest. I mean....two or three rings and you get a real life HUMAN!!
Think Them Crooked Vultures and you get an idea
Also, GB customer service is WAY above the rest. I mean....two or three rings and you get a real life HUMAN!!

