Summary: A quick sidenote I actually own the ATH-A500 headphones but they use the same drivers so the review should be similar. I picked these up on a whim at this place that imports Japanese products for around $100. This is my first pair of SQ headphones so I was suprised to find how big they are, the drivers completely cover your ear. My favorite part about these things is how comfortable they are, I could seriously wear these all day and not have an issue.
Summary: I've had this headphone close to 4 years now. I purchased this along with a Creative X-fi Xtremegamer sound card as my first "hi-fi" setup. Before that I was using cheapo Voip headsets, which was the very definition of bad sound reproduction. When I first got them, I experienced the "wow this music is totally different from what I remember effect". The A700 are great at reproducing details in the music, letting you hear all the nuance that makes music, to me, fun.
Pros: Extremely comfortable, great sound positioning
Cons: high maintenance, not well rounded for all music genre
Summary: I purchased these trying to find a pair of 'entry level' over-ear headphones that were closed so I could listen to music with other people around without annoying them with an open design or annoying myself with something that wasn't sealed. Comfort was also an extremely high priority for me, as many headphones give me tension headaches or migraines. I was pleased with my ATH-EW9's, so instead of taking a gamble on a brand I hadn't heard before, I went with AT again.
Pros: Versatile, comfortable, affordable. Highly recommended if you get headaches easily. Great detail and texture.
Cons: Not at all portable, hit and miss with hip-hop and some electro.
Summary: It's been years since I had a pair of headphones, and I'm quite impressed with the sound of this unit. Comfortable, with very good fidelity, they encourage use. Buy an extension cord if you want much freedom of movement.
Pros: Comfortable, Good Bass, Good Value, Great Sound, Lightweight, Snug fit blocks out noise, Stylish
Summary: I don't feel expert enough to compare the sound quality to other headphones, except to say that these sound fine to me, and have what seems to be the right amount of bass. From some reviews I've read, I was worried that they'd be too big and fall off my average-sized head. But no, they stay on fine. They are lightweight and have only a light clamping strength which makes them quite comfortable to wear.
With excellent sound fidelity and a wide sound stage these are a great pair of headphones for the price (current street around $120 US). My only quibbles come from the mechanical design of the headset which leads to unwanted sounds when listening at low volume levels. If subtle extraneous sounds don't bother you, then they may be perfect for you.
Excellent sound quality - Extremely wide soundstage, clear instrument separation and strong, but clean bass.