I've carried one in my change pocket for the last year and a half. It's small enough that it just disappears. The type III hard anodizing is so tough that it shows no signs of wear.

Actually, it's small enough that I would have to fish around amongst the change and sometimes keys to find it. I made an orange paracord lanyard, nothing fancy, just a loop about 4" long. It makes it easy and fast to find in the pocket.

I use lithiums in it. Mostly for the peace of mind to not have an alkaline battery leak.