Oh man, I go hardcore typing stuff all day on my G510 an no wear that I see. All the logitech ones I have used have no issues with wear.
Intel Core i7 2700k (4.8 @ 100x48) Watercooled - 16GB Crucial Ballistix @ 1600 Mhz 220.127.116.11 2T
8GB Corsair Vengeance @ 1600 Mhz 18.104.22.168 2T - Asus Sabertooth P67 - Asus Radeon 7970 Ref. (Non Ghz)
Heatkiller 79xx Ni-Bl (Soon) @ 1050/1500 - 64Gb Crucial M4 SSD - 3x Hitachi 1Tb - Corsair TX950W
Azza Genesis 9000B - 2x Samsung SyncMaster S27A550H - Vizio 32" LCD