I've the ART Tube MP and the Hootersound B1 (which is essentially the same pre-amp as the V3, I think). Comparing the sound, I would say that the Hootersound is far superior than the ART unit. Much, much sweeter and cleaner. I hate to admit that I don't like the sound very much since so many people like the ART TUBE MP. The TUBE MP is warm though if that's what you are looking for.