I've eaten here a few times, especially since I work in the same building. Bill's is fine, really. It's not a stand out place for me but it's a good place to go in a pinch when I've forgotten my lunch or we don't want to go outside in the winter or super hot days for work meetings.
Although, I can only base my opinions on their salads because that's all I've gotten here. Their salads are good. When you dine in, they give you a nice portion. But when you pick up, the portions seem to be a bit small- though this is the case for a lot of places when you pick up, never really knew why. I also order their homemade chips and they are super finicky with it. They don't give you many at all, yet they charge you too much for it. The service is nice, though. Never had a problem!
Again, I only eat here in a pinch and it's okay. Lots of other good options around this area to eat instead.