My AD still has an NDB and I get tested every year but I also recall on two occasions in past decade getting caught out
One failing to monitor NDB on last segment and have the old KR86 switches go noisy and giving false bearing. Saw the Grampians on RHS of the aircraft and had decided not to descend to 20 mile lsalt early like some people do was not on track and would have hit Mt William like a guy called Wills did decades back.
Second was at Temora flying by a thunderstorm needle pointing to cloud did not see station passage let down in valley approaching YOUNG between ranges.
Still alive and still doing NDB approaches and will stack them against NPA GNSS any day.
Tricks with NPAs are to do them correctly and how they send you 15 miles away from the airport whereas NDB is done from overhead and you often get cloud breaks and can get visual. FWIW 2 cents.