I was sitting in section 106 right beside the stage and I thought the sound was very good for both Yob and Tool. I didn't see anyone disapprove of Yob either, barely any one was there when they played but there was a fanbase for them that cheered for them.
Only dickhead thing I heard the whole night was a conversation between two long time fans who were in their 40s:
"did you see the opener?"
"no, I heard they never have any good ones"
"yeah fuck the openers, you get to see tool"