I owned too many over the years. I kept selling them to raise money, and missing them bought another pair, or found some at a good price etc.
Like any vintage binocular they may suffer from damage, poor handling, care, or just time and age.
A good pair of these are great.
Compared to other binoculars in my limited experience is a richness of the color of things you are looking at. (Not false color!). Most other binoculars by comparison appear to wash out the colors.
I had a pair of the Miyauchi 5x32 that also had that richness of color. And I looked through some Zeiss 7 or 8x42? These were new about 10 years ago. They were the best I've looked through. They may been a fluorite model?
Ergonomics: light weight, easily hand held, fit in the hands is good.
These were a bit of a disappointment for astronomy use. Maybe at a really dark sky they would do better.
I would treat these with care. They are not water proof, mud proof, Bourbon proof and I would leave them at home if you are going on a dune buggy/motorcycle Baja run.
I have not compared them to more recent ED binoculars.