It's a sandwich. A huge sandwich with fries and coleslaw on it.
Primanti's is one of those places people love or love to hate, but I'm just ok with it--I don't really think it's fair for me to give a bad review, since I'm not a big meat eater and only get the cheese.
I find myself eating here once a week or so during the school year, and when I do, I don't have to eat another meal that day. So...if you're hungry, in Oakland, and haven't stopped here I would recommend giving it a shot.