I'm not a SPG person, but have moved all my business over to Hyatt and Priority Club since they both really deliver to their elites.
I've got 11 nights booked at Hyatt this month, and was able to use the last of my Diamond suite upgrade certs on these. The Costco Hyatt certs aren't hurting my bookings, either.
I wish I could find a good use for my Hilton points and be rid of them.