I honestly think this earphone deserves much more attention, but perhaps it has to do with market availability worldwide.
I trust the reviews/graphs from GoldenEars based on their rep and my own experience with headphones I own/owned. It's accurate.
I'm currently in a position searching for a pair of new earphones with
excellent frequency response. To my surprise, the LG quadbeat and its new edition (red edition) that just recently released excelled extremely well on the frequency spectrum and with an above average final scores in every categories from Golden Ears. The other good option I found is the Sony XBA-4.
So based on the graphs, they perform really well and hardly any major flaws. Unlike many other much much more expensive earphones that suffer from major flaws such as - 1. recessed bassed or exaggerated bass, 2. recessed mid or over emphasized mid, 3, rolled of treble or treble spike. These headphones are fairly close to a Golden Ears target (aka a much more linear response = truthfully to the original source with minimal coloration).
I'd say with such a beautiful curve like this, it beats A LOT of those $500+ ear mon.
http://en.goldenears.net/index.php?mid=GR_Earphones&category=112&page=1&document_srl=15834
Now let's look at its outstanding scores for the
LG Optimus G QuadBeat (Special Edition)
http://en.goldenears.net/en/files/attach/images/108/834/015/d5392e82430c469590f56a3bae3de4a4.PNG
I've to say it's very impressive indeed for the price you pay. I haven't got a pair myself yet, but I'm very eager to try them out! I'd love to hear what you guys think