I got my top of the range DC in 1992 and have been using it ever since
My H10-40s were purchased in 1990 and still in use having been through the mill of private and turboprop flying for nearly 25 years.
Sennheisers were standard issue in the jets and fine for a relatively quiet flightdeck environment.
I'm not sure how these lightweight headsets would stand up to years of private flying and instructing?