Have you seen ljokerl's monster review thread?
http://www.head-fi.org/t/478568/multi-iem-review-328-iems-compared-lear-luf-4f-luf-4b-luf-4c-added-11-07-14-p-994
RE-400 neutral sound, good isolation but miserable build quality. My pair died after a couple of months and I'm not the only one.
Sacrifice some neutrality and go with the detachable cables and better build quality of the Shure IMO, they isolate great too. They're warmer than neutral with some extra bass but it's not a bass head iem or anything. MA750 is too v-shaped.
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