I have a pretty old set - an M65 mouse and a K70 keyboard -- both are probably 5-6 years old now? Both still work great, but as part of my COVID bored-out-of-my-mind housekeeping purge, they both had gotten so disgusting over the years I finally just replaced them because I couldn't clean them well enough to my liking.
I have them in the closet as standby / spares, but can't complain at all about craftsmanship or longevity of the things. Neither of them look new any longer, but physically they held up better than that rubberized stuff Logitech tends to use. My only complaint was the coating on the mouse - it was kinda like Line-X or truck bed liner - really rough, almost like it has grit in it. It hurt the heck out of my fingers for the longest time - until I built up calluses and most of the sharper edges kinda wore down.
Case in point, the replacement mouse was a Logitech MX Vertical - maybe a bit more than a year ago (I think I made a post here about it). It's not the full on rubber coating that the older ones had (the one that turned into snot), but it does have a slightly rubberized texture - kinda like a Rubbermaid container. It's already worn off and really shiny in spots. Battery life is excellent though and I haven't had an issues with it running dead while using it. The vertical aspect helps a lot, not 100% effective at taming wrist pain, but much improved although it did take a while to get used to it.
