Won't be making it and in a way I'm glad. Don't think I'd be able to choose between the two stages. A classic Corsten set would be quality and, although I've seen him 4 times, it's never been at the Arches.
The third arch is a cracking lineup IMO. Saw Benny Benassi there two years back and he was excellent. D-Wayne warmed up for Afrojack in Ibiza this summer and was far better. MakJ's recent releases have been brilliant and Blasterjaxx will blow the roof off the place.