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Basically, the pros are playing it now - earliest it'll come out in English is in March. Cons are it'll cost money, and if you want to understand everything and all, you won't be able to unless you know Japanese, even less so if you haven't played GSC. (Slightly helped by guides/the FAQ and Help thread here, but nonetheless...). Main lure for people is basically... well, playing it now and not having to wait! Made more sense when it came out in Japan and all, and makes sense for those who played GSC at least, but now when it may be out in little over 3 months... well, that's for you to decide. No harm in playing through it twice after all (heck it's fun XD), but up to you if you are willing to pay the $$$ and all just to play it early and all.