When it comes to replay value it's all over the place. You've got all 9 girls to take on vacation as much or as little as you want, tons of stuff to buy, relationships to build, and preferences to learn. I mentioned before that the relaxed feel of goofing off on the island was like popping a pill, well as you know pills can be addicting.
If you are looking for replayability, its packed into the gathering of goodies and the likely chance that you will want to feel this story again one day whether you are gay or straight, boy or girl. It is delicate and strong, it is close to masterful.
I realize this seems a bit harsh and others aren't saying the same kinds of things, but they are strolling through poppy fields. In this shortage of JRPGs we are letting anything go, and this game needs serious help rather than free passes. Give it a go only if you really need your Tales on the go.