I think the Z-5500s sound great, although I have the Klipsch ProMedia 5.1's myself. Honestly I wouldn't say that the Klipschs are phenomenally better than the Z-5500's, but I'm ceratinly no audiophile. They both sound awesome. My set of ProMedia's is six years old now and they still sound awesome. Plus Klipsch still has parts for them (grilles, satellites, etc.) and good support. Decide with your wallet; if you can splurge for the Klipsch, go for it. If not, the Z-5500s are very good.