Via Chicago forum just about sums it up, when they say "How many bands can go from pretty acoustic folk to Krautrock wig outs to gospel tinged bluesy rock to straight-ahead rock or pop and remain incredibly on and unified throughout the whole show? Amazing musicians, fantastically varied and melodic songs and a great dolefully funny front man in Jeff Tweedy."
If you love great rock music (and just about every other shade of music) then check them out. In fact, here are links to a couple of great videos of live songs, which I found via the excellent Wilcoworld.net website (no need to wait for the whole thing to load - just click play);
"Impossible Germany" from the "Sky Blue Sky" album.
"Monday" from the "Being There" album.
Oh, and just in case you like what you see/hear, you can catch a live live webcast of their show at the Paradiso in Amsterdam tonight (16 November) at 7.45pm (8.45 Central European time). I'll certainly be tuning in!