I don't own any of their albums but I grew up with a few kids that were big into them. They're really good and Chris Barnes is a death metal god. I remember the first time I listened to them and on one of the tracks my friend claimed they were using a brillo pad as a guitar pick...my reaction was "Whoa." (I was going through a Keanuu Reeves faze I guess)
On a moderately related topic, of the three new tracks on "Curtain Call" only 'When I'm Gone' is remotely good, and the other two ('Fack' and 'Shake That') are just more garbage in the vein of the Encore album.