The Pro 900s have three pressure points where it contacts your head: the two earcups and the top of the headband. There are indeed gaps anywhere in between these three points. The velour pads, along with clamping force, make the Pro 900s pretty comfortable and I feel that their weight is distributed pretty well. I am pretty sensitive to pressure at the top of my head (both K701 and the D2000 caused a bit of discomfort there) and I can wear the Ultrasone's for an hour or so before I need to readjust them.
The pros aren't heavy.
The pad on the headband is the only part that touches the top of the head so why have more padding.
Pro 900's earpads look more puffy than other ones so they probably are more comfortable than some other Pro models.
The pros have a pretty good grip on the sides at first but after some time loosens up.
How does the headband loosen if it is made of plastic? I meant there are large gaps between the side of your head and the headband itself, meaning the headband doesnt conform to the shape of a human head and is more like a rounded square instead of a half circle. I recently had the pro 750 and the Dj1 pro and both of them had gaps big enough for me to stick my whole hand through and not touch either side. For example the worst of the crop were the Shure 840 in design, huge gaps, both ultrasones put 100% of the weight right at the crown of your head and only offered a thin strip of padding.
I was asking if the pro 900 did the same and after looking at some pictures and the specs sheet, it looks like its designed the same as all the others