i just watched the few cmt outcuts, they put on their website. i really hope i can get my hands on a copy of this whole concert here in germany somehow.
not to mention that mayer's and urban's voices match together perfectly, their guitar playing in this particular show is simply awesome. i think everyone here knows the feeling of having a good day and having a better day on stage. their performance looks and feels (!) like they had a perfect day together.
plus i like the idea of having the two different bands up on stage aswell.

by the way: the duesenberg campbell is a hell of a guitar. i've played one of the two prototypes, back then without the f-holes. those sound a lot more like a les paul.
the regular version you can buy on the street sounds more airy and warm, not that aggressive - somewhere in between es and les paul (at least in the bridge). anyway, i can really recommend those duesenberg guitars - not only the campbell model. by the way: dieter (gölsdorf, the owner of duesenberg) is such a nice guy. when you're in germany go visit him. he always takes time for his customers.