Eh, I bought about €21 worth of stuff for ACI (The Unlimited Campaign Ticket, Rookie Pack and a pack of five more fuel), then I played through what's available of the campaign so far (five missions). Got 40 fuel total after finishing it due to buying the Rookie Pack (gives you five fuel), the pack of fuel (five more), completing mission 5 (which gives you twenty fuel) and opening the notification which gives you ten more and I've been playing a good bit of multiplayer...
I suppose it's....
INCREDIBLE.
Seriously, I haven't had this much fun with my PS3 in weeks. The gameplay is great, the music they have chosen and the ones PA has remixed from former AC games are all awesome and the story is very good so far, with all the characters being very likeable and despite only spending five missions with them, I feel very attached to them, especially Viper. The new Edge (AKA Kei Nagase) and Slash are really cool characters, Omega, while somewhat annoying at times, has a great sense of humor and I admit to chuckling a few times and as aforementioned, Viper is an awesome character and while at first you might not like him all that much, you really come to have a bond with him.
And then there's the campaign missions. Just wow. Especially that fifth mission, which had me on the edge of my seat and my heart beating like a machine gun the entire time. I won't spoil anything, but it is just amazing.
The multiplayer is great too. It lacks a bit of variety, but hopefully PA will release more missions with the next few campaign missions, which will apparently be free, as will new planes and the like.
I highly recommend putting some money into it. Even though I started out with 40 sortie fuel when starting the multiplayer, plus the 3 supplied fuel, I still haven't gone below 35 stocked fuel thanks to the challenge rewards. So, put some money into it and you should be good for a long time, unless you're a hardcore AC fanatic who plays thirty missions per hour. Currently saving up for the Expert Pack as we speak.
Only thing I could say that I can put as a con, and it's super minor and doesn't do anything with my enjoyment of the game, is that the multiplayer has gotten much more difficult since the Beta. Scinfaxi is almost invincible and the ace squadrons are not only hard to shoot down individually, but have much higher numbers than before too. Whereas in the Beta I was getting A ranks almost all the time and I got S ranks once or twice, the best I've gotten so far in the release game is one A rank on Aerospace Center Defense...