HBO Go is a GREAT addition. Last weekend I binge-watched the whole first season of "The Newsroom" preparing myself for the imminent S2 premiere. But that meant that not only did I have to eventually plug my iPad in as the battery ran down, but I couldn't use my iPad for other stuff while watching. Having HBO Go on the ATV is excellent.
Last night, immediately after updating, used it to watch the Series Premiere of "True Blood" then the Season Finale from last season, in preparation for finally watching the S6 Premiere.
Could have used the ESPN update a bit earlier, though, like when the French Open was on. Guess it will come in handy for Wimby, anyways.
Anyways, good stuff all around. I originally bought the AppleTV on sort of a whim. But I find myself using it a LOT these days.