Big fan here. Seen them three or four times as well. Their best, hands down, is
Traveller, but
Atavism is really, really good as well. Since then, it feels like they've been on a downward trajectory, but
Hardworlder and
Ape Uprising! (awesome title) both have their moments. Of their earlier stuff, there's something especially cool about the debut (which you'll never find, ha ha), but really, they have yet to put out a bad album. And if you haven't heard Hammers of Misfortune yet, you need to get on that, also.