Summary: I had the 500s then I heard about these. The design was particularly to my liking. I read reviews stating that these were most refined in the series. The bass is not as crazy as the 500s and details are presented better. These are perfect for most of the music I listen to regularly (EDM).
Pros: Deep Bass, Comfort,
Cons: Mids could be better, Availability and Price
Summary: I owned the XB 500, 700, and the 1000s. I currently own Denon D7000 and Ultrasone Pro 2900 (so I may compare).. The XB 500 and 700 didn't give me any benefit to my current setup, they sounded muffled, the bass was present but not very clean, they didn't suit my taste.
Pros: Bass pressure, sound isolation, sound stage
Cons: expensive for the audio quality, gimmicky big cups
Summary: This headphone delivers exacly what master engineers was planning on their tracks, giving you a good punch and balance between all frequencys range for any kind of genre.
With a low impedance configuration all SNR can be easy noted from the system used, easy fixed with a good AMP/OP AMP avoiding max...
Pros: Timbre, Frequency range, Isolation, Construction and Comfort.
Summary: After several reviews and comparisons, I decided to purchase these bad boys basically cause I love deep bass and loved the looks.
I have them as the exclusive laptop audio output, since the day I received them, my 5.1 speakers burned :D.