I got a new pair of DC H10-13.4 after many years of playing about with cheaper models. What a revelation!
After that I bought a second hand set off ebay for the passenger. Obviously that was at risk, and there is a tiny amount of microphone whistle on that set. However, the price of having that pair serviced and repaired still left me very much in pocket.
In fact, the guy who did the repairs also sells ANR conversions for the H10-13.4!