AntiSonar is metal, I went for a couple of days last last year, stayed til about lunchtime after the main Sonar stuff had finished - Pretty much til me feet gave way. It was pretty hardcore, at one point I was sitting around on some bricks at the back watching two punks snort something scary looking. They took turns holding each other up while they hovered shit up. Proper fucked they were. Also, the dusty ground ruined my kicks!
Sonar though, was amazing, best time ever I think. But then I was out of my tree for most of it, so I could well be lying. Not really impressed by the line-up this year though. MIA, Justice, BusyP, Sebastian, Mehdi will all be good... Maybe I need to check out some of the other artists.
Still, I'll be there again.