If the story isn't your thing, then it'll be a lot of "skip skip skip" for 90 levels. As for the free trial, it is free. You don't get the full experience for nothing. Many of the restrictions are in-place, in my opinion, to curb RMT and isolate the subscribed playerbase from the free-to-play players. You can't earn over 300K gil. Can't trade it. Can't create parties, Can't /tell or /shout.

All things considered, since you can get to level 60 and all the content before that - for free. That's a sweet deal. If you like what you see, you subscribe. If you don't, then you don't. It is probably one of the better free-to-play trial-type options, especially from a well-established MMO.