The only bad comment that I have read on the sound quality of the AH-C300 is here in this thread. It is from Eugguy saying that these have sharp treble. From all other comments online, and I have searched quite deeply, it seems like these have an awesome sound even for audiophiles. It seems like everything on their sound profile ranges between very good and excellent. That makes me wonder why don't we see more reviews and comments as compared to other IEMs for which there are more negative reviews. In other words, if these are so awesome, why aren't more people buying them even taking the risk of not getting a good fit and having to sell them later or just putting them away? An awesome sound is worth the risk. Something doesn't fit in this picture. There aren't enough people raving about how good these sound, but everyone that tries them seems to find them awesome in SQ. That doesn't fit.
Well they just look ridiculous is the answer.
They stick out at least an inch from each ear, if I could get this form-factor in a smaller package I'd happily spend 300 euro, I already have IE8s and no they are not as good, at least for the music I listen to. They also have a 3 ring jack, I'd say this is for Iphone control or something, my Cowon hates 3 ring jacks.