As the migration of SPG properties continues, my Sheraton stays that are booked for December migrated over to the Marriott system last night. I wanted to give you all a heads up to be careful if you have reservations booked that have cancellation dates/T&Cs on the SPG site, because they may change when they migrate between systems.
I had late December reservations that had a cancellation date of early December that immediately were past the grace period for cancellations (60 days prior to check-in).
Fortunately nothing moved for me that I plan to cancel, but check those cancellation dates before you cancel something that has migrated over. I had a couple reservations as I was trying to book redemption travel and availability was changing, so fortunately over the weekend I had cancelled all the reservations I didn't think I need any longer!
Also a curiosity as I almost re-booked the stay because the elite line couldn't get my SNA request to populate today. The stay was calculating higher in fees by $50/night on the Marriott site than the SPG site, because I had a child on the reservation (under 17) which hadn't incurred a charge on the SPG site - might be something else to watch for.