Summary: Along with the summary below, I have posted a Youtube video review of the XB900. If you like the video, check out my channel for more reviews :)
The XB800 has a very chunky design which looks pretty neat and offers high isolation.
Pros: Bassy, nice design, high isolation, folds up compact
Cons: Plasticky build, very high clamping force, not very breathable, difficult to wear around the neck
Excerpt: Simply the best combination for a bassehead+audipohile. The bass is unmatched. Previously i've owned xb30ex, xb90ex, xb400 and a few Sennheiser over ears. Nothing comes closer to bass reproduction. The bass is tight and surrounds your ear. The experience is like having two Sub-woofers on your ears.
Pros: Comfortable, Good Bass, Good Value, Great Sound
Summary: The delivery was done with amazing speed even in middle of holidays i got the package in couple of days. now about the headphones- SOUND QUALITY- it does what it says gives an extra bit of bass, so much so that you would actually explore bass at places you never expected.
Summary: Solid value for your money - one hell of a headphone - very good bass and the highs and mids sound wonderful too - have tried other headphones too but this beats them all hands down - it may take some time to get used to it , little heavy on the ears and looks bulky but is actually light - pls buy...