Sure have!
I went to a concert of his in the fall at UMass Amherst (the h is slient for any of you non-Massachusettians) and he was FANTASTIC! I bought his Roots cd right at the concert then downloaded his Gemini cd off of iTunes about a week later and I keep forgetting to get some more $ on my account to buy his other cd. Hes a great musician and is really funny.