The beta is winding down and I ground enough Online Co-Op Missions to unlock and purchase the F-15C (~70,000 credits). The core action is the Ace Combat I love, but that didn't stop me from worrying over the amount of grind the full release will have. It took about 5-8 hours to get my F-15C and that's with activating the contracts that boosts research and credit gains.
My biggest concern is the Fuel system, the game's energy/fatigue system that counts down and limits your flight time. I don't like fatigue systems in general, but the current allotment of 2 units (or 2 multiplayer or single player missions) for free is extremely limiting. It makes wish I could just Bandai Namco $60 to have the freedom of play and a more sensible pace to unlocking content.