The rooftop bleachers are a very overrated area. They're blue colored bleachers and resemble what you probably sit in when watching your son's Middle School Soccer team. Just another way for the organization to increase the capacity a little bit and squeeze out a little more money to pay the inflated salaries of these players.

The center field concessions are made of brick and will keep a good bit of fans in the bleachers from seeing parts of center field and the rest of the outfield. You can't see the warning track at all from these seats.
The only positives are that they're cheap seats, just feet away from the ballpark's best concessions and feet away from restrooms as well.
It's not someplace I would sit more than once and in fact, it almost resembles the rooftop seating outside of Wrigley Field in Chicago.