As you seem to already be "in-know" about DOXA and the policy and so forth - and if you are okay with that - I see no probem buying one. Especially not pre-owned.
Quality seems fine.
I hunted an orange dial DOXA for the longest time and finally got one. After years of searching for the right used one, I was underwhelmed when I finally got it. I never wore and ended up selling it.
That how ever does not change, that the quality seemed quite okay.
If you want one, go for it. You can always deceide later whether or not to keep it. They seem to shift easy enough.