Been buying refurbish whenever possible. All are almost as good as new.
Personally, I feel that there is no need to buy Apple Care unless your device fails on you within the 1st year. Then you may have gotten a lemon, and potentially more problems. Further, after 1 to 2 years, there are new laptops out there, which may have improved greatly in terms of specs. Might as well just change a new one.
Out of my many Mac devices, only my 2009 27" iMac failed. And that is after 4 to 5 years. I still managed to trade it in at $500.