I just purchased an Apple-refurbed 2015 MBP. It was a little surreal to be paying almost full price for a 4 year old model. The list of "pros" for the purchase decision was mostly a mirror of the "cons" of the more recent generations.

Overall, the 2015's are reliable machines with only the relatively minor annoyances of the battery recall and the "staingate" anti-glare coating issue.

Really hoping Apple returns to the ethos of their older designs, with serviceability and modularity higher on the list of design goals.

I have the 2015 MBP and I think it's the best laptop they've ever built.