Personally, I would really recommend to wait for the final version of Yuin G2 to appear at Head-Direct, which should be soon. I have the pre-production version and unfortunately it sounds unbalanced - the treble is way too prominent. However, Fang at Head-Direct said that they will fix this issue in the final product and if they do, that would make the G2 a terrific clip-on for the price, maybe even better bang-for-the-buck than the KSC75. I compared my G2s to KSC75, and if you consider each part of the frequency spectrum separately, the G2 blow Koss out of the water in SQ IMO, offering a far better clarity, separation and accuracy, plus they are lighter and more comfortable. Now, if you have the money, Yuin G1 is even better and should really put KSC75 to shame in SQ, but it does cost a lot more too at $149. I never heard any Audio-Technica clip-ons, but judging from user impressions I have read of them so far, they must also pretty good - maybe not better than Yuin, but better than Koss for sure.