Ray, you are not alone feeling that high clamping pressure that causes a fairly heavy point load on the top of the head, which never really goes away (after a month) and it is always a relief to remove them from the head.
To me, the overall sound is quite good but I could find it a little in your face and irritating on some tracks and I found it can lack a bit of body in the mids which I would have liked - but then it probably would lose that airy open feeling that makes it different from others.
It is probably something about the emphasis in the upper mids/lower treble that I have a problem with (but not with all music).
It seems to do best with female vocals rather than male (but it is still decent).
I think that the Sundara is good but like most stuff it has its flaws and overall I could not justify keeping it - so I have returned mine to Amazon UK.
I will stick with my Fidelio X2 (with modded cable) and have also returned my Beyer DT1990 (which I have owned twice, which is good but a bit bland for me).
So far I have resisted the urge to go for a desktop setup and will remain with a practical portable DAP for use around the home, etc.
My challenge will be to continue looking for the value for money stuff that I can recommend to family, friends and fellow Head-Fi'ers.
I am looking for an all-rounder and I believe the Sundara does not tick that box...................................... the journey continues...........................
.......................OOPs...