I've also had my GB for about as long, and although i don't carry it everyday, I've taken it to the beach and gotten sand in it, used to (gasp!) pry out a bolt from an SUV tire, sliced mangoes and other fruit, vegetables, and even used it to cut up steaks on the grill. Maintenance has just required blowing it out with canned air and a few drops of Tuf-glide. I had to fix some tiny chips after prying out the bolt by sharpening it on a diamond stone then paper wheels, but other than that, I've just stropped it lightly. I've taken it apart a couple of times and have polished the pivot surfaces and washers, and its still as smooth and solid as the day i got it. There's barely a patina on the blade despite the non-stainless nature of CPM-M4. It's one of my favorite EDC knives.