I bought a used pair of H10-30's that had been modified with an aftermarked ANR (don't know the brand). I don't know how old the modification was when I got them, but it worked great when the power cord wasn't shorted out. I wish I'd had them when I instructed - they did a great job in the Chieftain four hours a day, seven days a week. The jack on the power cord wasn't designed for serious use though and about once every three months (or 350 hours) I'd have to re-solder the connections, usually after flying a few days without the ANR and going insane!
I finally got the opportunity to trade up to something quieter...airplanes, that is - not headsets!
I used to fly BE-18s and MU-2s and I got sick of putting ear plugs in before putting on my headsets. I added the Headsets inc. to my headsets and love them. I added them to my wifes set also. I agree about the plug. I changed it and created my own NiMH battery pack that is smaller than the one it comes with and lasts about 30hrs. on a charge. I've compared them to a lot of other ANR headsets and love mine. I have a few friends with the Bose Xs and Lightspeeds and I still like mine better. Take care.
P.S. They work great in the small piston singles too.