I'm 6-feet tall and have a fairly large head and ears (not gigantic, but largish) and I find the PM-1 ear cups ample to be just fine. I found the earcups in the similarly shaped Ultrasone Ed.8 I used to own too small, just for comparison.
I also had trouble with too small earcup openings on the Stax SR007 mk1 I used to own also. I do find the velour pads more comfortable (insanely comfortable, actually).
And the depth is good on the PM-1, so my ears don't touch the drivers at all.
Edited by rgs9200m - 6/7/14 at 8:57pm