Re: O2 size
I am in BK 401, and searched the net, to find out more on O2 Seats. I found the following on a non MJ forum. Block A: on the floor, is BEST (with A2, the best of all)! It's the closest you can get to Leonard. The only disadvantage is that if you are a small person, you might find your vision blocked by people's heads, as it's very usual for the floor block to stand up, and the seating is not tiered. This is the only block you can really read the expressions on the artist's face.
Blocks 101 & 112: are very good: They are the tiered side blocks nearest the stage. Because of the tiers, noone's head is in your way, and because this is the lower tier, you don't get vertigo like you get in the upper tier (the 400 blocks). The down-side is you get a side-profile vision of Leonard.
Block B: is good: on the floor behind Block A (the front of Block B is about the 25th row of the auditorium).
Blocks 102 & 111: are good: They are the side blocks in the middle of the auditorium. You get a side-frontal view of Leonard, noone's head is in your way, but the artist is the equivalent of 30 to 50 rows away from you.
Block C: is far away, so Leonard will look small, and there may be heads in your way too. On the other hand, you are in the thick of the crowd, so you get a real concert vibe, and you can check the video screen for Leonard's facial expressions.
Blocks 103 - 110: are far away: you have to rely on the video screens to see the artist as anything more than a tiny stick figure, but at least you aren't scared to stand up, should you wish to do so, as you might be, if you are in the 400 blocks.
Blocks 401-403, 420-422: are scary, because they are so high up you feel afraid to stand up. People there tend to stay seated, no matter how carried away they are by the music. On the other hand, these numbers are close enough to the stage to really keep an eye on the artist from your rooted-to-your-seat flight-position in the aircraft that is the O2 upper level.
Blocks 404-419: are both scary, and far away from the artist, so you must rely on the video screens for the artists movements and expressions, even as you clutch your arm-rests for fear of falling a very long way down.
I've sat/stood in most of these areas, and that's how I find the seating in the O2 Arena. So if you haven't been, I hope you find that useful. helpful: