I can't fault my Peltor 8006's. Bit bulkier than the David Clarks, but they fold down small if need be. Far better seal round your ears in my opinion, more comfortable (10 hours one day from Mackay to Alice Springs in Oz), and no compatibility problems in the 10 or so different aircraft I've flown in over 130 hours or so. Only cost me £130 too, but that was from Cloudtop, who I think have gone bust...