Adrian's Digital Basement has featured lot of videos on restoration of many TRS-80 versions. Seemed like a nice machine for its time.
Tandy Radio Shack (TRS) make some decent computers. My first IBM compatible PC was a Tandy 1000. Used that through-out college.
Good stuff that got stuck with a bad nickname.
To cite a reference, the first issue of "80 Microcomputing", a magazine dedicated to the TRS-80 line of computers. See the second paragraph of Wayne Green's editorial "80 Remarks" on page 8:
https://archive.org/details/80-microcomputing-magazine-1980-...
I spent 10 years working at Radio Shack, and the TRS was typically referred to as 'trash' but more people I spoke with.
Of course then, plenty of people working for the company could have been opening trashing it in front of corporate.