I bought one though the theaters and restaurant offering sucks where I am. But, I could use them on a trip somewhere I hope. I also found a Hilton offer I am evaluating.
$40 for a $500 Hotel and Resort eGift Card Featuring Hilton Hotels World Wide
The site that manages this is www(dot)hotelandresortcard(dot)com. Apparently, they cap the amount of discount you can apply towards a reservation. I haven't played around much to get a feel for the percentage but, it looked like 10-20%. Moreover, when I checked Conrad Singapore early January, their prices were ~$50 cheaper than of Hilton website (without any discount applied on the site). I am wondering if this site can be used for BRG.