Take the rows in the order D to K, then row L back, in alphabetical order, noting that these seats cannot see to the roof or the arena due to the balcony above. Check with the box-office before buying. Legroom is adequate in all seats. This was the infamous stand that collapsed a few years ago. These are divided into two parts, the lower tier called the Balcony, with portable seats, and the upper tier, rising directly behind, called the Gallery with fixed seats.
All blocks have double rows of metal bars in front as well as a gangway.
The view is not badly affected but theatremonkey advises row D back in all blocks before choosing C then B then A in that order. Blocks 23 and 26, at an angle to the arena, offer the best view and value in this monkey's opinion for arena events except Opera. Then choose blocks 21 and 23 for a central sideways view, or 24 and 25 for a view down the length of the venue. Personal choice here. Then choose blocks 22 and 27 over 20 and 29 for a better overall view of arena events.