The cool thing about the upper deck at this ballpark is that there are only two levels. If you've ever been to other MLB ballparks like DOdger Stadium, Yankee Stadium, you know that there are four or five levels of seats and as a result the fans' sight lines suffer greatly. Not here.
533 has good sight lines and you can see almost the entire Wrigleyville neighborhood from up there, something you can't do from the bleachers.
The seats are fairly cheap for most games but the real headache is climbing the stairs to get there. Make sure you arrive to the ballpark in plenty of time to make it thru security and to your seats in plenty of time before first pitch. Of course, knowing most Cubs fans, they don't arrive till the third inning after pounding beers at the Cubby Bear.