I loved the performance.
Scott came in a little off key for the very opening, but caught himself right away and the rest was near perfect. I think he's just not used to singing it a half-step down (or however much lower they are playing it)
My biggest problem is with Letterman's sound guys, they just don't know how to mix it perfectly. Dean's guitar seemed a little low in the mix IMO.
Over all, it's deffinitely Scott's best televised performance since the end of Velvet Revolver. Great to have the boys back to pretty much full strength.