Well I got the R30 set and listened last night - I guess I was curious to see if it was better.
It was and it wasn't.
The venue acoustics were terrible...and the guitars and vocals were rather muffled and often distorted....it seemed to suffer what vinyl fans would call digititus or compression distortion.
The drums were indeed much better recorded on R30 than Exit Stage Left and Show of Hands. The video is tremendous quality on R30. So this is big plus for those who concentrate on video!! However, the band is not tight! Serious timing errors occurring on a regular basis and Geddy's voice ain't what it used to be. Still amazing for a bunch of aging rockers - few bands could pull of such an amazing performance but it is only a pale shade of what Rush could pull off in their early years.
Overall verdict, after reviewing extensively all three ( Exit Stage Left, Show of Hands and R30), I prefer Exit Stage Left for the sound and musicianship ( nice analog sound and great venue acoustics ). Exit Stage Left is an awesome concert and the musicianship is first rate - they are at their peak and you can hear it - you just can't see that much as video is crap - although seeing Neil play such an assortment of percussion is impressive. R30 is frankly kind of ho-hum musically - the timing is more often off than on. Show of Hands is also very good and better sound than Exit stage Left....but Exit Stage Left is the one to get...it is a classic. This is the only one I will replay.