Having myself owned both the Shure SE215LTD and the Yamaha EPH-100 (I returned the former to buy the latter), I can say that the difference is a matter of taste. While it is true that the SE215 LTDs lack some degree of finer detail, the Yamahas have such an underwhelming midrange that you might have to EQ them heavily if your music favors it.
Heavier rock especially seemed to come to life on the Shures, where the Yamahas excel at folk, electronic, and anything else that either focuses on the fine detail of the recording or which needs a solid low-end kick in the pants.
With that in mind, know that I regret returning those Shures just about every day, and I'm thinking of re-buying them. I mention this because I'd hate to see another person make the same mistake because they thought there was a chance of improvement with a cheaper pair.