I got HD700 a few weeks ago after using HD600 for 8 years.
It is a little bright for sure.
I had very mixed feelings about it to begin with - sometimes I could listen to music and just enjoying it a lot without noticing any brightness, other times I literally could not stand listening to the HD700 for just 5 minutes.
Yet other times I listened to the HD700 for 15-20 minutes thinking it sounded good, but then when I took off the phones my ears would actually hurt from the brightness.
After 100+ hours of break in I still think it's a bright headphone, however I have found out that choice of amp can make a difference with the HD700.
With the Meier Audio Corda Classic the brightness is much more a problem than with the Graham Slee Solo Ultra Linear, both of which I own.
That said I can now listen to the HD700 for many albums in a row without noticing any brightness, then suddenly I hit one recording where brightness is bad.
So I'd go as far as saying the brightness is mainly a problem with bright recordings.
The sound of the HD700 is much fuller than with the HD600, and thus I simply cannot go back to the HD600 now that I have heard the HD700.
Also the comfort of the HD700 is outstanding.
I have tried around 10 or so headphones in my life and the HD700 totally beats them all comfort-wise.
I will have a hard time buying new headphones from now on because I will compare their comfort with that of the HD700, and it sets a high standard for sure.
Don't disregard the HD700 based on users saying it's no good.
A lot depends on the equipment you use it with, but also on your perception and tolerance of "brightness".
Also take into account the concept of "brain burn in".
A headphone that sounds bright to you to begin with may slowly become more and more acceptable if you just keep listening to it, simply because your brain adjusts to the new sound.
Don't forget too that there are people on all forums, not just this one, that simply replicate what others have said about a headphone without ever having tried the headphone for themselves.
A headphone can easily get a bad reputation this way which may not be completely deserved.
My advice to you would be to buy the HD700 from a store that lets you return it within a certain time frame, for example 14 days.
Then you can try it out at home in peace and quiet, with your own gear.
Sometimes when the HD700 sounded bright to me, I'd switch to the HD600 and a quick listen with that made me conclude that it was in fact the recording that was bright, as the sound was also bright with the HD600.
So it is not always the HD700's "fault" when something sounds bright.
Edited by hbuus - 12/28/15 at 11:33pm