Komplett were awesome on returns for me.
I ordered 3 TFT monitors.. and one was faulty. So I sent it back and it "got lost in transit". Basically, it got scanned in at a depot but never left it.. and they couldn't find it.
Went on for like a month of me chasing the delivery company with no luck (insurance was only £100 and monitors were £280 each).
Komplett in the end said "This is getting silly, we'll chase the delivery company" and sent me another new one! Dunno if they ever got mine back, but they didn't seem to care.. got a new one the next day..
I very much doubt any other company would have done that.. especially as I'd organised the delivery etc.