Overall we had a great time, and felt this cruise was an excellent value. The Spirit may not be a newer mega-ship but is well-run and fairly well-maintained. We were dubious about the "Freestyle" concept, but now we are believers; it really is a nice (slightly more relaxing) way to cruise. The food, service, and cabins were good. And a fun Western Caribbean itinerary with 4 nice stops. One area needing improvement was the entertainment; we rate it as weak and feel it did not compare well with the other cruise lines.
Background: my wife and I are in our early 50's and this was our 22nd cruise. We have cruised with HAL, RCCL, Celebrity, Carnival and NCL. We arrange our own port activities; we like beach days and we are scuba divers.
The Freestyle concept: there's not really a whole lot of difference. Most ships are very similar; same embarkation, same ports of call, similar cabins, similar services and activities, similar approach to breakfast and lunch. The real difference is the dinner and the dress code; "Freestyle" is a bit more relaxed and has a few more dinner options.