mid 2009 core 2 duo 17" owner here - still works well - nothing replaced - has taken a tower speaker to the screen a few years back and just dented the lid a bit - a little longer to boot but one of these days I may put in an ssd - maybe... I will not let go of my 17!!! (I'm also still running my 2009 mac pro as well, using it right now as a matter of fact - I've added usb 3.1 to it and put high sierra on it - but otherwise no major upgrades). Apple does know how to make good hardware (recent reports of faulty keyboards on newer mbp aside)!