So far not good
I just downloaded the app to try and reserve a room. It took forever to find the hotel I needed even after I typed in many key search words. Once I got to the reservation page I kept getting an error message. Luckily I was able to call customer service to confirm reservation. When I checked the app for my reservation it says I have no upcoming reservations and no rewards points. Terrible terrible app.
castro129 about
Marriott Bonvoy: Book Hotels