I have the 4S's and agree with Pmotz and Lazarus28. These are the best in-ear cans out there IMO.
etymotic 4P earphones
I just bought these for the ipod....dont have the ipod yet, but used them with portable Cd players. They sound very "tinny" - elevated high frequencies? Not natural at all. Do the Shure ipod earbuds/ phones sound better? Do the etymotics sound different with ipods? Should I try the other versions of these phones?