Even if it's not free, for $30 it's definitely worth it. The visuals got overhauled and you get two great games for the price of half a game. FFX is one of my favorite RPGs of all time, I never played X2 but I heard that it is just as good.
If you answered yes to both questions then, no it's not worth it. Go set up an emulator which will run at an even higher resolution with better texture scaling and the original models were better.
If no to one of those then yeah, go ahead and buy it.
I didn't like any of those games all that much, but part of it is due to the fact that I am not that much into the turn-based combat system. I really loathe it. But the story was good enough, so would say you should pick it up.