We used to live in Sun Prairie years ago when we first moved to Wisconsin. The first place we ate at was Sir Hobos. At the time, the menu was really basic and not much seemed to be "homemade". To be honest, we stopped going there. As was mentioned below, there was a fire and they did a complete redo of the restaurant. The food seems a bit better. I do agree, though, with another "Yelper's" judgement on the cheese soup. Yuk. It's so thick, it heaps up on the spoon. I've eaten there a few times since the rebuild and it seems they are trying to change. I hope they try a bit harder this time.
A note: No carpeting this time around. It's very noisy. And the TV's do not help.