The expo itself is pretty lame - it seems like a few buildings in a field, next to the now-defunct Metrolina Speedway. We actually went for the Home Show, which at the same price as the show held at the former Merchandise Mart, is a complete waste.
You can walk through the entire thing in a few minutes, and it's just about worthless. Perhaps four rows of tables, and very few of them offering anything worthwhile.
As to the grounds of the expo itself? It's like a fairgrounds. Don't bother going if you're handicapped, because the spaces are close to the entrance, but they are also muddy if it's been raining. Not a good mix.