The Be Legendary rate is the exact one I was able to get a BRG claim approved for. There is a difference in the cancellation period (2 days w/ HHonors, 3pm day of with SLSLasVegas.com), but since it's the competing rate with the more liberal cancellation window, I would think they would honor it. I would press them for a clarification and to honor the $50 AMEX offer in addition to matching the competing rate.