John Mayer's version of Crossroads

I was listening to my playlist today and John Mayer's funky take on the blues standard "Crossroads" came up. I really like Mayer's interpretation of this song. Here's a youtube video of a live performance with extended intro and solos from the Letterman show. I know some folks, especially blues fans, don't like to or want to give Mayer credit for his fretwork, but I dig his style.