Anybody who doesn't have the Thank You DVD - you need to get it. That's just all there is to it. I'm sure you could easily find a very cheap brand new or used-but-in-good-condition copy on Ebay or Amazon for like way cheap.
Quite simply, this has some of STP's best live performances ever captured in an audio-visual setting.
Honestly, they should make it their goal on this current tour to match the overall quality and energy on some of the more notable Thank You DVD performances.
If they could manage that, then this Tour would be a must-see. Right now, it's only a must-see in the sense that you never know when an STP show might be the last STP show - so treat each one as if it's the only chance you might ever have.