One of the biggest problems was with the early reviews, they compared to 800's and at $1000 I would not have been happy with them either. At under $500 at amazon, these are great. The sibilance people complain about and the 6k spike I have not seen, is it because of the Ember, I don't know, but I would imagine Sennheiser may have tweaked some, and if not then there were alot of haters that just like to repost what they read instead of what they read.These are clear as a bell, and the bass is fine, not thunderous by any means, but it is there and accurate. If you want mega bass, you need speakers not headphones. Soundstage is larger than either pair of my 650's and I like them better, so will sell off the 650's. I am using dual Visseaux 6j5's, this also helps make them so clear. Not cheap to be sure, but getting kind of rare, so bought second pair of tubes. Have about 12 hours on these phones now and are a little more open than when fresh out of the box. This is my fifth pair of Sennheiser phones and contiunue to enjoy their vision.