The SVT/810 rig is the only one I've used where many audience members who don't have a clue about playing music have comments on how noticeable it is over my other rigs. True, nobody walks out when I use something else, but only the SVT gets that reaction.Lots of it had to do with whether you are "tone chasing" or just trying to get some low frequency noise to the audience in a convenient way. I personally don't find my SVT 4 holds up to my SVT classic, but they both hang out at my house while I schlepp a much lighter markbass combo to gigs. Doesn't sound as good as either SVT through a fridge, audience doesn't seem to care. Every bassist should gig an all tube SVT for a while as a right of passage, imho.