One problem some people are having with computer radios is that the clock battery dies after 5-10 years. These can be replaced if sent back, but not sure what would happen if it died while you were flying.

if someone is flying a 50 year old Heathkit, hopefully major modifications were done. They were wide band and were on frequencies that are now illegal to use

i have Airtronic radios from 30 years ago that still work. I might put in a sailplane but nothing good as the servo wires etc seem to be getting brittle. Wires inside the TX probably are too