My daily drivers for IEMs have been the MTPC/HF2. I wanted something with the isolation of an Ety, but with a sound that improved on the weak points of these IEMs. Enter the W4R.
So.. I've been listening to these for 4-5 hours. Yep, they're giving me the impression that they're better than any other universal IEM I've tried. Though part of me wants a bit more highs, the rational part is saying "you won't get that treble headache/nausea after extended-listening".
The bass depth/impact/extension is superb. For my preferences all I would want is even more resolution (guess I'd need to go up the ladder). Still, I can more or less hear every note the bass player is fingering in rock songs, which is the way I like my bass -- heard more than felt.
Mids are as good or better than the Coppers (which was the reason I liked them), with nice timbre and not too forward for my tastes... the singer is smack in the middle of the mix.
Highs are nice and extended, but again, less aggressive than I'm used to. I'm going to need a bit of psychological burn in here to get used to this smoother signature. I need to curb my addiction to sparkle.
So taken as a whole, the W4 have as much detail/separation across the range as my Etys (or possibly more) with "perfect" bass and clearly improved soundstage/transparency.
And for the more mundane aspects:
Pros:
+plenty of detail at low listening volumes (unlike copper), not fatiguing.
+isolation, with the triple flanges is excellent, near ETY level.
+light weight, very comfortable in ears, can be worn while sleeping on side.
+cable is replaceable, can be upgraded to EPIC mic cable
+carrying case is nice extra
Cons:
-The w4 is less forgiving of bad recordings and poorly encoded/low bit rate files than the copper was with it's "blended" sound.
-The braided cable will probably separate over time, memory wire is annoying but useful to cut down on microphonics when worn over-ear
-Expensive, even at 25% off. And to think... the ES5 costs twice as much o_0