My second hand DC H10-40s are still going strong. I bought them from my instructor in 1984 & they were a few years old then.
In 93 I sent them back to DC in the states to be refurbished. Cost US$70. Came back with new headband & pad, new mike, new leads & a new speaker.
I wouldn't buy anything else. These ones have been used & abused from 45 deg C desert to sub-zero snow & ice.