I recently picked up a pair of ATH A900X headphones and I have to say that I am very impressed. The sound quality is phenomenal on these cans right out of the box. I'll break it down a bit for those interested in getting these great headphones. Comfort 3/5 These headphones are insanely comfortable for me personally. The 3D wing system is great, I can wear the headphones for hours without taking them off. Initially the pads are slightly stiff, but after some time with them they have softened up a bit and feel great. I give them a 3/5 because the comfort is not across the board, these headphones are not for everyone in terms of comfort. My girlfriend for example cannot wear them because they are simply to big and slide down her ears. Having a bigger head is definitely a plus with them. Build quality 4/5 The build quality feels nice on these headphones. The aluminum housing is nice and although most of the frame is plastic, it feels built to last. The nylon wrapped chord is especially nice is very pliable and the metal plug is very sturdy, great quality here. Highs 4/5 The highs on these cans are great, almost no sibilance, they aren't piercing at all and also not fatiguing. I don't listen to classical much, but for testing purposes it sounds great to my ears. Mids 5/5 Audio Technica has the mids down pat on most if not all of their audiophile headphones, these are no exception. Vocals sound fantastic, you can't find many headphones in this range with mids this good. Lows/Bass 4/5 Most of the previous line of headphones in the audiophile section for AT have been a bit lacking on the low end, I can't say the same for these cans. These aren't "bass head" headphones, so you won't hear crazy pounding bass from them. What you do get is a nice smooth presence in the low end. The bass is tight, and it comes with a nice punch. A definite increase in the low end of the spectrum compared with some other AT offerings. I should mention that the headphones definitely are not portable. While they sit snug on my head, I would not to want to go for a run with them or take them with me on a bus. Definitely an "in your house" style listening experience. They are also an easy to drive 42 Ohm headphone, so they sound great straight out of a mobile device, laptop, desktop, etc. Amp's and dac's can always add to them, but aren't required.