SE215's are certainly awesome in according to users and reviews, but what's the point to spend over 100$ for inear headphones?! In my point of view
A - if you are a runner buy a cheaper model, it will be fine anyway..when you are running it's has no sense to listen every hidden sound of the instrument, just drop the bass and run!
B - if you travel buy a closer headphones, for that price you have tons of models even with low impedence.
C - if you are at home follow B
D - if you are a musician buy a real custom inear monitor (if you're rich) or just follow B.
In my opinion of course