I have been to 8 NBA arenas, I travel plenty, and the Staples Center takes the cake. Of course, it's only appropriate that anything LA is done over the top.
Section 309, row 2 were my seats for game 3 of the Spurs series last season. What a game and what an atmosphere although I began to wonder where all of these Clippers fans came from all of a sudden? I thought Billy Crystal was the only Clippers fan.

The rows were a little tight and so were the actual seats. If you get stuck next to an overweight Clippers fan, lord be with you. Of course, why would they give you enough room to stretch out in when you're only paying $15 for a seat? They want you to buy the $100 seats, all sports organizations are that way.
Each upper level's entrance tunnel is at the bottom so be prepared to climb some steps. Also bring plenty of concession money, you're going to need it.