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Iv'e played FFx more than any other of the ff series. For me, after i finish the storyline i like to collect fiends and fight them in the arena. Also, I have started a few more games with a "challenge" such as fighting with only aeons, fighting with only Tidus, and fighting without ever using the sphere grid. That all adds a ton of extra fun to the endgame. :)
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I think X has a great replay value. As someone mentioned, you may play 250-300 hours to be able to collect everything you want. I'm now on my third playthrough, and I still love the game - and the FMVs!
