I can tell you that SPG has changed my mind. I am earning my 50K megabonus, then bamm-o...back to SPG. I will take EVERY stay that is not "incentivized" to SPG for 2009. See where it goes from there.
The ONLY plus that is keeping me at MR at all is free breakfast. I spend 3+wks/yr with the family on vacation. This adds up to ~$1100/yr (21 days X 3 People X ~$18/each -I DID keep track of it 2 years ago)!!! If (when?) SPG offers this...MR will get nothing.