I'm a fan of both bands, I think both are great - but I still think Intronaut would have been a better support for the whole tour. YOB are definitely suited to a smaller audience and people that dig their music; Intronaut are a fairly easy band to listen to for the first time and get into.
25/2 Alice In Chains/Down
26/6 Black Dahlia/Gwar/Amon Amarth
27/2 Dillinger Escape Plan/Glassjaw/Dir En Grey