1. Best sound I've ever heard from headphones (compared to Bose QC2, Seinnheiser HD-280/202, Audio-Technica ATH-M50). Frequency response sounds flat to my ears but it could use a bit more dynamic range. However, the great sound is partly due to their open back design which leaks sound like a siv. This means I can't listen to music as loud as I want sometimes when in the office or library.
2. Huge foam cushions are super comfy. I often leave them on for full 8 hour days with no comfort issues.
3. Well built mainly due to their simplicity. They have a very unique retro design which I like but others may think is ugly. 1 year warranty.
Audio is very subjective so reviews like this aren't worth much. Your best bet is to find an audio dealer that sells the headphones you're interested in for a couple hours of listening.