WetGeek I've had great luck with the "refurbished" computers I've bought on Amazon.
I use Optiplex and Latitude, and, like you, I buy refurbished and have had good experience.
In my case, I buy then-current 7000-series models sold by Dell as "certified refurbished". The computers come with a standard Dell business Optiplex/Latitude 3-year next-day on-site repair warranty. All are computers were returned by enterprise customers, some needing component repair and others just returned for whatever reason.
When I decide is it time for a refresh, I pick out the model I want from the Dell retail site, and then keep my eyes open at the Dell Outlet until the exact model I want comes along. Usually that happens within a month. I typically pay about half what Dell is selling them for retail. The reason I buy refurbished is that I can get a decent new business computer without busting the bank, and because I got the computer at about half price I don't feel guilty refreshing every 2-3 processor generations.
The $129 Inspiron 3180's (I bought two) were "throwaways", bought specifically for use at the railroad. The first died when the keyboard got sprayed with hydraulic fluid, and the other one died with a pop this morning, presumably of natural causes.
I bought a slightly better A9/R5/4GB/64GB Inspiron 3180 about a year after I bought the "throwaways". It was 2018's "get 'em in the door" special and I picked it up for $149. I bought it to play Red Alert 2 The Aftermath. It is the only computer I have at this point that will handle Red Alert 2's oddball graphics (I've never gotten Red Alert 2 running on Intel graphics), so I'll be careful with it if I take it to the railroad. I might use the Latitude 7390 (2018) I just replaced with a Latitude 7520 up there instead. The 7390 was more expensive than the 3180 by a factor of ten, but the 3180 is priceless.
I think that it is fun to learn about each other's buying habits and preferences. The more I learn, the more I discover that we are all a bit, uh, odd.
