I've been using the same CK headset since '99. I've never given it any maintenance, and I really don't even know it exsists most of the time except when I gaze lovingly at it. It cost a small fortune ($100 at the time) and was worth every penny. It also came with a 10-year warranty, and I don't think anyone else backs their headsets like that (though I haven't actually looked into that).

CK = worth it! But you won't be crying if you get an FSA or a Cane Creek, either.