I've been doing this for 2 decades. I once had a surreal experience when one store clerk in the US complained that my signature did not match the one in the back of the card. My pleas of "that's not a signature, it's a request to check my ID, which you haven't done" did not move him so I had to request his manager's presence.

It only happened once and that was many (15+) years ago, but if you ever wondered if it could happen, yeah it could. :)

I have both my signature (because it's required for the card to be valid) and "See ID" on the back of my card. I get asked for my ID about half of the time or so. It's rare to be asked at restaurants, but retailers are pretty good at checking.

I've always thought the signature was security theater, asking for a photo ID is way better from a security standpoint.

I do this, and I was very confused to find out that if you try to do this at some government buildings (post office for me) they will completely reject your card and not let you use it.