I had the rear right speaker on my Z-5500's go out the other day, so I called Logitech for a replacement one. I was expecting the usual- I send them the speaker, they send me a replacement, takes a good month and a half, the usual. I go through the process with the guy on the other end, and after getting the case and RMA numbers, he tells me he's going to ship an entire replacement set of speakers out to me in a week or two (once they get a new shipment in), and that I don't even have to return my old speakers once I got the new ones! So now I'll have two sets of Z-5500's- one with a one dead speaker, but I can totally live with that.