Yeah I saw this on vacation last month and couldn't wait to get home to try mine out like he has his. He is definitely running into an Ox Box BTW, and undoubtedly using the VH standard setting ('You Really Got Reverb' I believe it's called).
So at any rate, using the same guitar, amp, eq pedal, and Ox Box setting, it really does sound very good. My Boss isn't modded like his, but still I couldn't believe how much a difference it made. And for the life of me, like some of the other posters before I saw this I couldn't get the SVH20 to sound good at all...I even tried the Hot Mod V2 and it still didn't gel. The thing about that amp is that while it really sounds like a real plexi, the controls don't respond the same -- they are far more responsive than the real thing. So I kept trying the 'everything on 10' and all and it just sounded terrible.