I have a set of DC H10-40 that I bought 21yrs ago when I was learning to fly. I replaced the std ear seals for oil filled the same day. Apart from being heavy after 2+hrs wearing them, they were a great passive headset. 4yrs ago I tried a set of Zulus and loved the ANR aspect immediately. After pricing around to get a set, I settled on a DIY ANR upgade for my DC's, new wiring, new speakers in the ear cups, got new gel seals and new padded head band, all up $350 and I had a fantastic passive set with ANR to boot. I still love em and the guy whos Zulu's I borrowed has commented that they are great and although minus the bluetooth, comparable in quiteness (flying a C182 dumping meat bombs), but heavy compared to the Zulu.
My only gripe is the battery use, I get maybe 6hrs from a 9v battery.
Oneday Ill upgrade.