Car and Driver test drive of 500 miles experienced 3 instances of emergency braking kicking in erroneously. Twice when rolling up behind stop cars at street light and another time when changing lanes after car just passed.
These emergency braking system may save you from hitting something but people are going to end up being rear ended when these systems kick in for no reason. Read about same experience on Kia's K900.
I an a BIG Mazda fan and this is a nice SUV. Not a fan of all of these safety systems. I think there is too much of a rush to implement them before all the bugs are worked out.