Used mine in the past couple of weeks in:
Gatwick North Terminal - very basic, food not worth bothering with. It took them a while to confirm the card but they found it in the end. None of the London airports are pleasant places so any ability to get out of the general areas to sit down, relax and have a drink is worth taking.
Singapore Terminal 1 - it's the CX lounge. Walked in, walked around and walked out again. Not a bad lounge, but nothing special, and Changi airport is very well laid out and pleasant that I didn't feel the need to wait in a lounge.
Can't remember if they scanned card but they definitely took details of boarding passes, so I suspect at the very least they would check your name on the boarding pass against the card. But yes, if they don't scan or look at the card too closely, you might get away with using the card after it has expired or been cancelled!