We did this. The seats were good.
I had a few issues with this. They section off half of the front for people who do this.
I asked a guy at check-in how late we could arrive since you can get to Tusker as late as 1:40 for a 3:15 show across the park. He told me his doors close at 3 but if you have the pass they can seat you up to show time. I asked if that means they'll hold your seats and he said yes.
At 3:00 our entire group had made it and were seated. They started to let people who were just walking in the door into the front section. By 3:05 it was full.
If someone was seated a little late at Tusker they better make sure they get to the show or they're going to be squeezed in pretty tight.
Now two people who arrived after 3 who didn't do the Tusker meal stood up and started to wave to people in the back of the theater. They called to their friends and after the section was pretty tight, about 10 more people came down with disney people and were seated in the section.