I just called and confirmed our (large looking) group reservation for the Ise Kadoya nomihoudai next week, and learned that they've upped the one-hour price to 1,500 yen. Still a very good deal, and it also appears that a second hour is still only 900 yen. I'll try to confirm that next week when I slide into hour two with a hour-drunk-confidence that I'll be fine at work on Thursday.
So to be clear, it's 1,500 yen for one hour of unlimited drinking, choosing from Ise Kadoya's four main offerings, plus a rotating roster of guest beers from around Japan. Can't beat this deal.