I don't really have anything to add, but I agree with you, Beagle.
I haven't found them bright. To me, they just sound pretty close to right, realistic, natural. When I had my 650s, I somewhat enjoyed the sound (sometimes), but it just didn't seem real to me -- and that was a flaw I could not overlook.
Of course, everyone has different ears. I have no doubt to some, the 650s sound like live music sounds. If they feel that way, great! It's nice to find a headphone that sounds right to you.