Tex Thai posted a review of the EarTech Quad Driver IEM over on Head-Fi. This is not a firm I have previously heard of so I searched around and found a few reviews over the past few years of their other dual and triple driver IEMs. The reviews were positive for all of the IEMs.
Pros: They Fit!!! Rich, full bass and midrange; clear, articulate and extremely musical (fun, not analytical) sound. Great customer service, customization
Cons: A little lacking in high end “air”, resolution and refinement.