I recently got my hands on an Express and I decided to put it in the garage with some speakers. It's setup as a client on my Wi-Fi network so it's not doing any real work. I originally had it extending my network, but Apple recommends making it a client if it's for AirPlay only (which it is). It seems the iPad 2 and iPhone 4 both stream music to the Express without any drops. As soon as I stop either one and start music on the 4S, it drops within 10-20 seconds. I've narrowed it down to only happening on the 4s, even when listening to the same songs. On a somewhat different note, I have noticed my 4s getting extremely poor upload speeds on Wi-Fi. While the iPad 2 and iPhone 4 pull 2.5 up, the 4S gets 0.03. I even went as far as testing a 4 and 4S side by side and they still pull very different numbers. Is anyone having issues with either AirPlay or upload speeds on a 4s?