Marriott purchase the Canadian Chain of Delta hotels and resorts last year. I must confess it has been one of the most awful transition and merger I have ever seem. The communication was so tragic, I gave up even wanting to deal with Marriott Rewards.
They did not even recognize your GOLD status in the Delta Rewards Program and it was like you never existed. The misinformation was tragic and the way former Delta customers were treated was terrible. Now they have purchased Starwood Hotels - I am certain the same mess will happen. I only stay at Marriott when I have no choice, but dread what will happen to SPG account.