3rd row is big enough for adults, leg room & head room, comfortable bench seat; 2nd row captains chairs were an option that I chose; easy to get around 2nd row and into 3rd row. I believe the Acadia was 11" longer than the Toyota Highlander.
Cargo capacity - there is room behind the 3rd row seat for 2 small suitcases; Also, the 3rd row is a split fold (about 30/70) for the flexibility of cargo & passenger storage.
Looks sharp, lower than an SUV and long; some say the front is boxy, but I disagree.