I also recently got a link from Steve to this show, and I was also astounded how much better it sounded than other copies I had in the past. I always thought that the 1/22/73 was stellar quality with decent performances of most of the songs, but I could never get past how low Robert Plant's vocals were in the mix. Steve somehow managed to push the vocals up in the mix where this show is now elevated to a very enjoyable listening experience.
In a way, this show has always reminded me of 4/24/69 in terms of sound quality. With the 4/24/69 show, the on-stage mics capture the band's sound perfectly, but again, Plant's vocals are quite distant in the mix. I wonder if this show might be a good candidate for a remastering job to push up the vocals?