A customer at Gap told me her monogram speedy was 20 years old. It looked old, but still very decent looking. She told me it's very durable. I believe the monogram speedy's quality is equal to the damier, so it'll last you for yyeearrsssssss.
I scratched my Mono Neverfull at a corner of the rough wall of my house - I could HEAR the scratch and feared the canvas/silicone might be scratched, since there where white lines visible.I agree - it is very durable. I even dropped my Speedy (soooo sorry!!!) on grainy floor and it did'nt even got a scratch. Of course I would not drop it a second time...!