I’ve been using the same 2012 rMBP day in day out since I bought it. I carry it everywhere with me, even on a sailboat when I went on a few months sailing trip in 2015. The thing still runs everything i need for work and non-work (webdev + Final Cut Pro mostly)
I have had to do some surgery on it though (resolder some chip related to the GPU power because I missed the recall window), the battery only lasts about two hours and the screen has a few dead pixels.
Pretty happy about my purchase to be honest.