I was there in 2010.
During the nights they turned down the volume by something like 80 %, that really sucked!
Besides it was freezing cold at night, and hardly any food stands.
I was a bit negative in my post, should have been a little more balanced
Of course it wasn't all bad, the general vibe was very friendly and the nature was the best ever!
Even without the music, just camping there next to a fresh (ice-cold) mountain river and setting up a little campfire was very cosy.
But also the showers got its water straight from that river, so you can imagine how fresh you felt afterwards.
And I don't know how they handled the night music volume situation this year, but if they fixed it, it all together must have a good experience