George Dobrescu posted an extensive review of the DK-3001 over on Head-Fi. From the review it sounds like a great 3BA/1dynamic driver IEM. Priced around $500, it is middle of the road for a quad-driver IEM.
Pros – Relaxed Signature, Smooth Sound, Strong Bass, Large Soundstage, Good Instrument Separation, Good Comfort, Large Number of Accessories Included, Useful Carrying Case, Great Value, Musical, Romantic, Natural
Cons – A tad too polite for metal music, The sound Might be too relaxed for some.