The survey has six multiple choice questions which you can complete in seconds, and then you just have to enter your Marriott Rewards number.
The 100 Marriott Rewards points should be credited to your account within two weeks.
Personally I value Marriott Rewards points at ~0.8 cents each, so to me that’s less than a dollar of value. That being said, the main benefit of getting 100 points is that it extends the life of your Marriott Rewards points. Marriott Rewards points expire after 24 months of inactivity, so this is a great way to extend the expiration of those points.
This is great for someone like me who has some Marriott points, but only rarely stays at Marriott properties. This just extended the expiration of my Marriott points by several months.
So I’d recommend taking less than a minute to complete the quick survey.