Quote: I haven't heard the GR04 but based on what I have heard from VSonic, you'll likely have to look outside of VSonic for a sibilance-free dynamic-driver earphone. It doesn't have the best treble but the Yamaha EPH-100 might be a good option. It's not as relaxed up top as the SE215 but really isn't sibilant and has no real midrange recession. Another option would be the Dunu Tai Chi - it's not as bassy as the Yamaha but still not bass-lean, and has smooth highs. The HiSound Crystal also reminded me of an SE215 without the treble dip and missing some of the smoothness. Good bass, though, and under $100. Quote: The regular SE215 worked with my (non-otterbox) case. There is also an aftermarket smartphone cable with mic/remote that should be more case-friendly. The sound is fine - bass is definitely punchy. When you factor in build quality it's still a very good deal.