If it had even vaguely stank of 'old blokes trying to recapture former glories' I'd had instantly hated it.
As it happens, i thought it was awesome. Very classy, and rehearsed to do it justice within their current capabilities. And yes, Jason was incredible.
My only disappointment was that the bass is lost in the mix on the Blu-ray, and they didn't do Carouselambra.