Summary: I bought this in 2012-06, when my Brainwavz M2 broke. It was given a Sonic Diamond by ClieOS for the pre-order price and 4.2 / 5 for the sound quality, so I expected quite a bit.
Unfortunately, the cables are nowhere near as good as those used on the M2.
Pros: Sound is not terrible, CTIA plug (on the microphone version)
Cons: Flimsy cable that tangles easily, overpriced compared to other earphones
Summary: Brief Backstory:
I ordered the mic'd version on a whim during the brief time MP4nation had them for $28.50 on Amazon. I figured they weren't too common, and it was almost 75% off MSRP, so it was worth a shot.
Pros: Deep, impactful bass without sacrificing clarity
Cons: Driver flex, inferior cable on the mic version
Summary: Build Quality, Packaging And What Have You
The packaging is typical Brainwavs fair – a black box with a window that displays the IEM. As far as accessories go, there’s the three pairs of single flange eartips in small, medium and large and a pair of Comply S400 foam tips in black, which are my...
Summary: you can refer my Xiaomi Piston 2 review as an introduction to this one, because this two are indentical in general. the only difference between they're, is the frequency balance i think. M4 comes with 125-250hz strong bass frequencies amplified on somewhat level.
Pros: Vocals are free (compared to M5)
Cons: Size of sounds are small. Acoustic of instruments are limited. Treble quality is slightly below average. Bass isn't a monster.