I saw them live a half dozen times at the zenith from 1969-1974, once in 1985, and finally in 2007. With minor concessions for aging, the quality & energy level of last year's performance was impressive. PT's guitar technique has actually improved over the years, and the youthful & worthy back-up band of Starr & Pallidino have deep lineage in R&R. In the old days just as now, Daltry was sometimes hoarse. Moon was often drunk and Townshend pissed at Moon. While some of that friction served the music, it obviously couldn't sustain for the long term.
The original great-sounding vinyl was issued on Track Record/MCA. I'm foggy on this but recall reading somewhere that the original mix was compromised by layers of analog tape overdubs used to create this complex album. One of the later CD remasters may have tried remixing using first-generation multitracks.