If you have a hard case on your iPhone you can forget about these headphones staying put.

I can see the argument both for and against the hard shell case and the one for the SE315's will work great, just differently

It seemed that it was the thick hard case that caused me

But after what I'd call a premature (2 years) failure of the wire on my SE310s (always coddled and in a Shure hard case when not in use) that I'm going to enjoy my

Sure, I can send them to SHURE for repair, but paying extra cash for repairs for an already expensive piece of tech- that prematurely is causing problems- shouldn't be even be the case to begin with

The only part I like is that you can change the cable in case it breaks and not loose the buds

They have also accompanied me on a flight to Las Vegas and back, (from Florida) as well as on international flights from Philadelphia to Barcelona and back.

What's REALLY great, however, is that Shure provides a packet of EIGHT different types/sizes of earpads (S/M/L rounded foam; S/M/L rounded hollow rubber; a silicone "tree" type, and a foam cylinder, so your chances of finding ONE set/size that actually fits YOUR ears is excellent).