I have the last model 17" mbp that was made (late 2011) and even though I had the foresight to order it with an SSD upgrade, it's showing it's age.
For most tasks performance is ok (I assume ssd access is much faster in newer machines though) but it's a maintenance issue now.
I've had.. 3 mainboard replacements I think (failed discrete gpu). A swollen battery. Just had to replace one of the fans, and due to its age it's now a solely DIY option. Apple won't repair it for any amount of money and their authorised repairers can't order parts.
These days I think a multi-machine setup is more practical, (and with a wife & child I work a lot more from home now than I did 5 years ago) so my next machine will likely be a 4K iMac, with the 17" relegated to "definitely need a portable" duty.