We were very impressed with the WindSurf. It was clean, the staff was very friendly and the food was excellent. WindStar markets themselves as being "casual elegant" and that is correct. They do not have the European level of service as Seabourn, but you should not expect it.
Service in restaurant was good and the menu between main dining room and bistro gave you ample selections to choose from.
The ship is a great size and fairly stable. When we did have a 55mph headwind, we found ourselves 2-hours behind schedule and were not sure the ship would fit under the bridge going into Lisbon. It was very exciting as they sent a crewman up the mast to advise if we would not clear it - we were close! Had we not fit, they planned to tender everyone to the dock, not a good option for people with lots of luggage or flights close to arrival time.