We sat there 2 yrs ago. I believe all seats have arm rests. We got tickets through Stubhub, and were probably about 2-thirds of the way up, about 30 yd line. I don't remember there being anything that would block your view from anywhere in the upper deck.
The upper deck at Louisville's pizza stadium is about as you would think. It's high, but not as high as our stadium. Our view 2 years ago was unobstructed and even saw a nice sunset over the other side of the stadium. If you want a beer or KY Bourbon, you can walk down the steps to the concession area and imbibe...for a steep price.
The worst part was the long, long switchback ramps leading up to the upper deck. I'm gonna try to post a photo below. We actually took stairs down after the game that were much less time consuming. The stairs are at the ends of the upper deck.
Have fun and JUST WIN!!! I don't expect the Cardinals fans to be as friendly to Clemson fans on this trip!