I wanted a Mac for Vellum and Scrivener and got a refurb MacBook Pro. Picked a seller on Amazon with many, many good reviews. Even though Amazon wasn't the "real" seller, it was a third party through them, I figure Amazon is a good backup that assured me I really could return the thing if it wasn't as advertised. It was - is after about 6 months. It came with a one-year warranty. It's a late 2013 model with 15" screen* and has beefed up RAM and hard disc, latest OS installed and was a little over a thousand dollars.
The listings for the refurbs rate them as to condition and give an idea of what flaws cause anything other than Excellent. I figured anything less than Very Good, even if the flaws were all cosmetic, had been treated roughly and wasn't worth considering.
My Kindle Voyage needed to be replaced after I'd had it 6 months or so, and they replaced it with a refurb. If it had been represented as new, I'd never have known the difference, and it worked fine for several years until I traded it in when I got an Oasis.
So those are my 2 refurb experiences and both were good.
* I had a prior Mac experience and got a 13" MBP that was new but an older than current model. That was also good, but I never resigned myself to the 13" screen when my Windows laptop was 15". I'm much happier with the refurb 15" MBP and actually using it.