Professor Thump et al: I've read some great reviews of the S4s and am considering buying a pair. Could you, or anyone who's tried them, answer a couple questions for me? 1. I spend a lot of time outside. I switched from Etymotic ER6 to Shure SCL2 because the former was terrible with wind and cord noise. The SCL2s have a heavy cord and nearly no noise. How do the S4s compare in this regard? 2. For me, the biggest drawback of the SCL2s are their replaceable wax guards, which only last a few