Marriott and MGM have launched a cooperation.
You can soon book MGM properties, including the MGM collection, with your Marriott account to get some benefits if you earn a status.
The main benefit is that from Platinum Elite onwards, you can expect free upgrades, priority check-in as well as late checkout.
As an Ambassador Elite member, resort fees are waived, you will receive suite upgrades as well as some more priority handling during your stay.
Read all about the promo here.
Bottom Line
It might make sense to book your MGM property trough Marriott to earn some points, and benefit from your status. However, real value is reserved only for top tier status members.