On Wednesday, September 2, 2020 at 7:27:38 AM UTC-4, krasw wrote:
On Sunday, 30 August 2020 at 16:29:32 UTC+3, wrote:
I have installed many used units with no long term issues seen.
Me too. No problems with the six I have installed.

We have a big pile of them, all garbage.

Surely not "all garbage"? Maybe some units had problems? The 4201 in my glider has been soldiering on for many years. Last year I bought a spare one from Europe, it tested OK in a brief test. But most likely I will never need it.