The only common issue that sets rep ceramic inserts apart from gens is paint wear in the markers. And often this is just dirt - the markers will brighten up again after a gentle wash. Ceramic inserts can also look a bit grubby on the surface, from finger marks or grease. No different to the gen in that respect. Apart from marker paint wear, I’ve never seen or owned a ceramic insert that looked scuffed, scratched or chipped. They can however be cracked, most often during removal or refitting - again, just like a gen.
CF inserts don’t have a particularly good reputation when it comes to the longevity of their marker paint, sadly.
But it’s really not hard to do a DIY fix on the markers with either a silver metallic acrylic paint pen (the “Molotov Mod”) or enamel paint (my preferred medium, as it’s more durable).
