I was out of town when the second live 30 Rock aired, and watched both versions (east and west coast) a few days ago ON Demand. I don't think I saw any mention of it here, and had almost forgot about it when I saw this piece this evening:
http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2012/05/03/DD3U1OCC4R.DTL, which really captured my take.
When a thread on this list noted that there was going to be another live 30 Rock, I agreed with the main question of "why would they do that?" The first one was an interesting exercise, but ultimately not as good as one of their regular episodes. But the second live show was fundamentally different - as the piece suggests, less a live episode of 30 Rock and more a really good episode of SNL.