we have loaded the roof top carrier and back with camping gear and four people plus dog, driven around the olympic peninsula and never felt a lack of power. impressive when i think about it. we did not feel the extra weight at all. i am sure there is some measurable decrease in get up and handling, but not anything we felt.
the beauty of the Ascent was experienced when we put up the third row on the second day of camping (after setting up camp) and we were able to fit our friends who met us there into our car to drive around exploring various spots together for a day instead of taking two cars around. for a day of getting in and out, with 4 kids, three adults (with captain chairs) no one complained of being cramped. Also it felt the same as when i drive it alone.
the incredible beauty of the Ascent was apparent recently, after a major surgery for our son, we figured out that we could get him out of his wheelchair into the rear door with the seats down. He can scoot to the side, we put one seat up in the third row, he scoots over into the one seat and then puts his leg up on the put down second row seat in front of him. Then his large wheel chair fits in the cargo space in the back with the third row up, if we lift the lid of the hidden under the floor cargo space. The lid has velcro to keep it in the upright open position.
So we can get him in and out of a car, carry his wheelchair and drive him around with five other people.
Sure, there are other cars that could fit in him with similar configurations, but those cars are not subarus. We have a large car to haul camping gear and people, can handle a wheelchair plus 5 people, and has all of the things we love about Subarus as well. we could not be happier.
The reason we got the ascent was for him to put his leg up when sitting in the third row and it has worked beautifully.