It depends on how much a FF fan you are. If you really are a big fan of them, then definitely go for it. X and X-2 are great games in my opinion (my favorites actually) and merit a buy. In my personal opinion, I don't believe X-2's ending ruins anything that deals with X's ending. There was already talks of doing a sequel upon X's release (OPM Magazine) (SPOILER)and the Fayth stated Tidus would not vanish forever. He would be given a new world to exist in. (Go back and visit all the Chambers of Fayth in X) So, X-2's ending goes right along with X.