I've known some people who have. From what I've heard he is a nice guy, strange (Which is expected) but nice nonetheless.
Closest I got to him was at a concert of his. Next of his I got to though, I'm going to give hi a present when he passes out toys, then I'm going to go see him after the show is over, and take pictures with him and get a signature from him.

But also, there's already a thread on Buckethead, so *reported*.

            |  Jet fuel     |
            |  Can't melt    |
            |  Steel Beams  |
Quote by TheNthDimension
I'd run if I saw Buckethead come anywhere near me.

For real. Never know when the dude might go Texas Chainsaw Massacre on your ass.