Originally Posted by
genejockey
I've got a 2020 bike with 105, and it's excellent stuff. I've never used Di2, so I can't speak to that, but I'm firmly of the opinion that older bikes that were good bikes when new are still good bikes - they don't become bad bikes when new bikes come out. So, yeah - the one that fits is the one you want.
I agree, current 105 is really very good indeed. With older bikes, my concern is more the level of wear and potential abuse. Perhaps more so on mountain bikes, but road bikes can take a fair beating too and some people put in serious mileage. I would always judge used bikes on a strictly individual basis and never buy sight unseen.