I haven't read the manga yet, but I'm enjoying the show so far. The production values are pretty good, and the music adds a lot to the atmosphere. Also, it's new, and I haven't seen much new anime in awhile. (New in Japan, I mean. Anime I've already seen most of the better stuff that's new in America)
Also, he Genshiken manga rocks! Unfortunately Kinokuniya Books only has volumes 1-5 in Japanese. >___>