Audio Items that rely on. Mechanics, are made known through numerous reports that can be seen, are able to be classed as very high quality in their function. Add to certain models modern replacement parts and reports can be found that are offering a good appraisal.
As for electronics there are endless reports to be found about how attractive the end sound is that is produced. There are are also tweaks and mod's for certain models/designs that are reported on as being substantial as an improvement.
We make our own choices on the devices selected to be used in a assembly of an audio system.
For me, end sound evaluation is usually where the decisions are made to make changes to the assembly of an audio system.