I haven't had any issues with the Eidolons so far (knock on wood), but they are fun to command. The story gets pretty good the further you get into it also. I have like 23 hours logged so far, but I am a level up whore in all FF games so I have probably spent a good 5+ hours on CP farming alone.

I am about to start chapter 9 where if anyone is nearing chapter 8, CP farm like CRAZY!!! There is one part in particular that nets you 640 CP...go back a few points and they respawn. I started chapter 9 and my players have like 30k CP to level up. About 45 minutes will net you close to 15k of CP. One of the best places in the game for time:CP gained ratios.

After playing thus far, I am liking everything more and more. They say to not level shit up until later in the game so I am waiting to do all that...I stupidly leveled 2 things up to level 5, but other than that now I am laying back. Another negative I don't like is you don't gain gil from fights anymore, so wanting to buy stuff gets very picky.