Sorry I took so long, I was going back and forth between my XB1000s and the 900s and trying to get a good assessment. I still want to compare some more, but I've come to a conclusion for now. The XB1000 wins easily... in the comfort department. Other than that, I want to throw the XB1000s in the freaking trash, wow. They 900s so much clearer and more detailed, the artists in the songs almost sound like different people entirely. So this is what hi-fi sounds like. I'm sorry but whoever compared the XB1000s to the 900s before is wrong IMO. The more I listen to them the better they're sounding too, especially the bass. Speaking of bass, they're the king, but you already knew that. They don't do every part of the bass the best, for instance the Darth Beyers can go deeper, and the XB500s and 700s can do rumble type bass from bass tracks better. Overall though, it's still the best because it goes pretty deep, has a good punch to it, and it can rumble some as well. The highs are on par with the XB1000s and the the mids are a good bit better. I still can't believe how much clearer they are though, I'm listening to them now. Whereas the Darth Beyers just have bass and the XB line just has bass and highs, the 900s are the whole package in my opinion. Amazing bass, great highs and good mids.