Omfg, these games are really... huges. I can't get any words to tell you how this game is an unbelievable experience: you have to purchase it. You will have at least 200 hours of content if you want to do the 100% of FFX and FFX-2... Both are available for only $25, sometimes less. Damn, even if they are old games it deserves that money!
Personally, I bought it but I already had these games on PS2 (I finished them a few years old): I wanted to redo the experience.
Everybody will tell you that FFX is better than the FFX-2: they are right. FFX-2 is just the afterpart of FFX: it's so good to visit again almost every place, every character you saw when you did FFX but gameplay aspects like fighting which is no more based on a turn-by-turn, plus the pop music, also less feelings (you can't be Tidus/Auron/Wakka..)... So yeah, FFX-2 is good, but if you compare it with FFX, FFX is really better and can be considered as a masterpiece.

Pros:

• [FFX] Impressive history, its very interesting, emotional and you'll get a lot of cutscenes for the story, with beautiful textures!
  
• [FFX and FFX-2] Huge lifetime (mainly on FFX, you can have 200 hours if you want to finish everything). Story is less than 200 hours of course, maybe its 40 hours for FFX but you'll want to finish everything!
  
• More options than the previous game on PS2: you are able to see the FFX Eternal Calm (video which was only available for Japan when PS2 game came out). Eternal Calm is a video which introduces FFX-2. You can also play FFX-2 Last Mission, which is a mini-game like a very very little FFX-3. Always better than nothing.
  
• OST is really cool from the beginning to the end, it will put you in a good mood!
  
• Generally, just the games, they are so good. I can't list all good things they have!!! There will be too much thing to say.

Cons:

• 30 FPS-lock: seriously, first and main con. If you do things that require precision and you don't have some good computer specs, you must temporarily put the game on a lower resolution (800x600) and low texture qualities... It sucks. I did that to achieve the 200 lightnings, you know that mission....
  
• Assistantship: the remaster game contains too ♥♥♥♥♥♥ features: you can disable the fights (normally you must farm and drop a weapon to avoid this), you can generate your overdrives or generate some gils (the money of the game, WTF?).. This can be made through the menu... by pressing a button! It's a pity to have these features on the games, normally it should be a bit long & difficult to do the 100%. It's over-cheated and should not be inside the games in my way of seeing Final Fantasy. But as always, we casualize games....
  
• Patch: lmao the joke is that Square Enix said that for technical reasons, they can't put JAPAN voices with European subtitles (JAPAN voices only for some asian countries, & Europe/US must have the ENGLISH voice). Fortunately, a person has created a patch to unlock this (because yeah, it's a shame for SE, we all know that "technical reason" is a lie). With the patch you can play the game with Japan voices while having your European subtitles. Thanks to people who made that but it's a shame for SE: they don't put this in the original game and a modder was needed to have this.. lul.

Recommended: YES, damn you can't avoid to do this so good experience...