This was the second Ben Folds album I bought after accidentally seeing him perform live (dual-headlining with the Divine Comedy); the first being "Whatever and Ever Amen". While "The Unauthorised Biography of Reinhold Messner" is a good and balanced album, I'd say it is less loveable than the other two I now own ("Rockin' The Suburbs" and "Whatever and Ever Amen"). I'd say the tracks are much more slow growers than on the other two albums, apart from the instantly loveable "Army", which is just wonderfully bouncy and sing-a-long. Another stand-out track is "Mess"; a powerful (Divine Comedyesque in the style of "Lost Property" from "Regeneration") rambling narrative with a forward-moving backing.
Other interesting tracks, I'd say, are "Narcolepsy", a bit of an oddity in waltz time and the other 3/4 track, "Lullaby". There are the usual Folds bitter and sad songs about love and relationships; not quite as notable as those on his other albums, however.
Overall, I like it quite a bit, but admit that I don't play it as often as the other two I have. I'd recommend buying this album, but only after having listened to some of the other Ben Folds stuff first. It isn't the best one to start with.