John Mayer is a " Very Good" guitarist..I've seen and been into so many guitarist that sometimes it's hard to be fair in a review, but I saw him last year in Virginia Beach when I was on vacation and he was "very" good. So if your just getting into him and don't want the "pop" records this would be a good start, it has a mix of both pop and some nice blues riffs with a great backup band.

Highlights for me are:

Gravity
Out of My Mind
I got a Woman