The staff was amazing. They see you coming in, and they help. Overall our experience at Harbor Center was a great one. The downtown area is a bit of a hike so I'd recommend a dinghy or bike, but the free trolley was very easy to clime on.
Sister Bay was beautiful. The people were friendly and the star gazing at night is something you have to experience. I wish there was better transportation to neighboring Fish Creek and Egg Harbor. This isn't a reflection of the marina, but just the town itself.