Hooo boy, this was a pain for me. I don't have an especially legible or even consistent signature (think doctor writing a prescription).

I was trying to exchange my TC for JPY at the hotel. The front desk manager kept on having me countersign the TC over and over again. I'd sign it, and he'd take it to his office to examine the signatures. He'd come back and then apologize and ask me to sign it "one more time." After I signed so many times that ran out of space on the TC, he finally said sorry, but my signatures didn't match. See, you have a loop here on this one, and it isn't here on this one.

Ahh...

So I signed it one last time, this time with the loop and he was happy and the transaction continued. So, +1 on trying for signature verification, but -1 on security and -1 on general pain principles.

This must have taken 15 minutes at least. It was done with the utmost politeness, but as noted, it's not fun trying to get to your own money!