I got the Houston DVD for Christmas.
Watched the whole thing about 2 hours ago; I have it on as "background" music as I type.
Oh my GOD.
I felt like that iconic "Memorex" ad: I was literally sitting in front of the tv, and felt like I was being "blown away" by what I was hearing and seeing....all I needed was the sunglasses.

All 5 of them were in "superhuman" form: After the first 3 songs, I was exhausted just WATCHING Steve sing and RUN AROUND !!

I have come to the conclusion that in this era of time, Steve was a "thoroughbred singer": He placed himself at a "starting gate", if you will, and then just LET LOOSE - with everything he had. Now, while that makes him a very extraordinary singer and performer, IMO there's a "finite amount of time" alloted to keep that up.
And sorry to say, but I think that 's what haunts Steve to this day: that people are expecting "that kind of Steve Perry" in 2005. Hell, the majority of people can't do what HE DID - PERIOD!
Jeremy was right: This concert IS "lightning in a bottle"