Amazingly, at O2 world you get strong O2 reception that actually works! (that's a rarity in…read moreHamburg). I'm still unsure as to what benefit you get for walking through the special O2 entrance, but I guess there must be one. Maybe I'll try it next time Anyway, back to the details of the place. It's actually quite a nice arena. It's very much in the middle of nowhere, but the train + shuttle bus service is pretty great, so it's not much of a problem. Beyond that, it's a decent sized arena, with good viewing from pretty much all seats. The bars and food areas are slightly underwhelming, but it's not a complete rip-off and the service is pretty good. The toilets are also pretty good for such a large arena. All-in-all then it's pretty good, 4/5.