The car is tighter fitting than I thought it would be. It looks huge on the outside for such a tight-fitting car. Materials are good and it's probably the best car in GM's portfolio, but it still has that "I'm sitting in a kayak" feeling. Ingress/egress sucks. Pedalbox is nice, but it feels like a rectangular prism of that cross-sectional area all the way to the seatback. It was a two hour wait to drive one so I chose to drive an Impala instead (ugh...) Basically, it looks like a 5 series on the outside, but it felt like a 3 series on the inside. Front and back. It's like... where did all the space go? It's like they sized it to be bigger, but it's just small enough in areas to be annoying. Like the back seat... man, it's so annoying. They couldn't add that extra inch here and there?
The Lexus GS is way more comfortable just because of the space you have. (Funnily enough, after I sat in one, I felt the GS was the only acceptable car in Lexus's lineup.) It looks like a tank from the outside, but you feel like you're in a car. The Cadillacs, however, all feel like the car is wrapped around you.