We have had no issues with this car thus far. The maintenance has been affordable too. Great for a family with 3 kids or less. There is a lot of trunk space even if you have the 3rd row up. I love the backup mirror, makes backing up a lot more comfortable.
If you have 2 babies in infant seats, it makes it really difficult to have people access the 3rd row of seats. They have to climb through the trunk. Other than that I do not really have many cons about this car.
The 2017 Mazda CX-9 has an average owner rating of 4.63 out of 5 which ranks it #6 of 17 other Midsize SUVs.
From the Vehicle History blog
Moderate Overlap Front
Side
Roof Strength
Driver-side Overlap Front