Thought I'd chime in with my experience.

Used Expedia.ca to get the BRG for 3 nights at the Grand Hyatt New York. I was surprised that they would honour the .ca website (Expedia.com had the same rates as the Hyatt daily rate). Was on the line for a while but well worth it in the end. I much prefer the instantaneous response via phone rather than having to make an online claim and having to wait 24 hours.

Room Type: Grand Club - 2 Doubles

Hyatt Advance Purchase Rate: $409.00
Expedia.ca Special Rate: $214.78
BRG Matched Rate: $172.49

Definitely feel like the cat that ate the canary.