the paper checks aren't worth it - the savings vaporize on the USD to local conversion while you give up the ability to recover the value if they are lost or stolen.
the e-Gift Cards have laughable security - I had the value stolen from last December's purchases - Hyatt did right and replaced the stolen value without too much hassle
The physical Gift Cards are the way to go.
I can also confirm the GPGIFT15 code works fine on actual purchase, despite the display Order Total mistake I showed in the original post