Just returning to WhiskeyDelta's question about the adjustment system on the Peltor. I bought a 7003 model headset just after converting my SLMG PPL to full Group A (as was) in 1989. I've now done about 400 hours wearing them and the adjustment is still as good as it was when they were new out of the box.
I can only speak for the 7003 models, which I find lighter than the DCs, but the Peltor "grips" tighter. I've done three hour flights wearing them though (over spectacles) without major discomfort.