It's probably worth a shot in all honesty. You'll figure out in your trial period whether you like it or not. It's also reduced subscription atm (unless that's because I play XI too, I'm not sure). Costs me like £6 per month anyway.
And it's also very easy to actually get to level 50 for endgame events so it's not like you'll be grinding away for months before you can actually do the big fights.
You'll also be able to pick up a copy very cheap. I think I paid £3 for my copy. It's apparently £5 on Zavvi and £5.50 on Amazon atm.
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Crucifying my Oracle average one match at a time