Okay, as of last night I'm about 17 and a half hours in, and have just arrived at Raithwall's tomb. I had a bit of trouble getting across the Sandsea at first, and my first try at defeating Garuda was a complete and utter failure. So I went back and leveled up more and fought the Urutan Eater and, if this game was realistic, probably would have made the Urutan-Yensa extinct; got two 50 chains while leveling.
Second time I fought Garuda I had better weapons on Fran and Balthier so I just had them stand back and shoot while Penelo whacked it whenever it got close enough to the ground and kept the other healed.
Right now Vaan, Basch, and Ashe are level 16-17, and Penelo, Fran and Balthier are 14. Penelo I'm basically turning pure white mage and have switched her weapons from daggers to staves; Ashe knows a lot of white magic, and a decent bit of black, green, and arcane magic as well. I've more or less taught everyone first level white magic powers. And as is fairly obvious by the levels, I use Vaan, Basch, and Ashe the most. Vaan steals stuff and attacks, Basch tanks, and Ashe attacks and heals.
And as I'm me, I've been comparing it a lot to FFX...Vaan is a Tidus-clone, which is obvious simply by his appearance, but unlike Tidus, Vaan isn't an annoying whiny bastard. Ashe is very similar to Yuna, but actually has a spine and will think for herself. Fran is Lulu, again, obvious comparison. Penelo is very similar to Rikku in appearance, personality, and even how she does attacks. And Basch is Auron - the older character who is famous (for whatever reason), has a tragic/messy background and a connection with the two leads, and is guiding the younger heros.
But unlike FFX, where I couldn't stand Tidus or Yuna, I actually like Ashe and Vaan.
So yeah, that's where I'm at and my thoughts so far.