The reason I have been considering upgrading my Ref2 VT200 combo is because there has been a lot of hype about how good the upgraded models are. I like the all tube gear and wanted an idea of how adding solid state inputs to their products would affect the sound. I'm sure there is improved bass and better dynamics, but is the sound really better? If they only changed the tubes, I would probably just do the upgrade, but adding transistors, I have to do some serious listening before I make any upgrades.