Absolutely Expo is worth attending! There is so much to do even if you don't want to spend the entire time doing pinball activities.
In fact my husband Pete used to go with his friends to the Chicago expo for several years in a row. One year one of his friends cancelled and Pete asked me to go. I went and I had a blast. I didn't spend the entire time at the expo though. I ended up doing a little shopping and visiting the field museum as well. I didn't know very many people at the time, but everyone was very nice and I got to know a few new faces and had fun playing pinball.
Over the next couple of years I attended other shows and started to get to know people. When I went back to Chicago expo a couple of years later (When they moved the show to the Westin) I never left the hall because I had so many friends that I liked to hang out with.
The Westin is a great hotel. It's very clean and great place to host the pinball expo because it has so much room, it's in a great location and it's easy to find. The service there is excellent too. There's also a lot of great restaurants and shopping places nearby as well.
Now, Pete and I make Chicago expo a yearly trip. We always look forward to getting together and hanging out with all of our friends. We spend the whole time at the hotel taking in all the pinball activities never feeling the need to go anywhere else. We always have an awesome time!
The only place I make sure Pete takes me to in the Cheese Cake Factory Restaurant because we don't have one of these where we live. Sometimes we even end up visiting the restaurant more than once.