I don't know much about STD. I checked out some stuff on their website and it sounded like pretty disposable emo-rock. Like bad Jimmy Eat World.
But the second opener, Fire Theft, is made up of members of Sunny Day Real Estate and Foo Fighters...but sound *nothing* like either band. I think they'll appeal to Grandaddy fans. I suggest going early to see Fire Theft and leave during STD.
And....ANY Grandaddy is good Grandaddy. I'll take an hour.