I agree with the above poster - we've seen him twice and he was fantastic, especially the first time around. The second time was VERY similar to the first, so I wouldn't go see him again just because he doesn't seem to be developing his act at all.
Just saw him a couple of weeks ago in Dallas. Tom Pappa opened. Both were great. I would say about 80 to 85% of the show was new material to me. (From both guys).
I went a couple years back and am going later in the month at Jones Hall in Houston. He was great then. His comedy is smart, and he doesn't resort to being vulgar to get a laugh. One of the highlights was him taking questions from the audience at the end and how quick he is with his response.
I also went in Houston a couple of years ago... it was a funny show. Lots of new material, and some classic stuff that I had seen on some of the tv show intros.