If the keys are anything like the keys on my G510 they wont fade for quite awhile. Heck even the used G15 I bought had no fading.
Intel Core i7 2700k (4.8 @ 100x48) Watercooled - 16GB Crucial Ballistix @ 1600 Mhz 18.104.22.168 2T
8GB Corsair Vengeance @ 1600 Mhz 22.214.171.124 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