After playing a ton over the last few weeks, I'm going to go ahead and say it's a great game; but I wouldn't spend a dime on it, nor would I buy any of their starter packs. Here's why:
Playing any tier but the starting tiers is just silly. Half the content isn't finished. Planes will literally have unrealistic flight models, causing them to either ram you and take no damage or being able to take massive amounts of fire and still survive. Matchmaking is TERRIBLE during prime-time; expect jets in your reserve matches. Planes ramming bombers and not taking ANY damage at all. I've had so many bombers destroyed by planes ramming into my bomber and they fly away. This patch has broke a TON of things, and they still have a lot to finish. They took an older game they made and basically gave it the WoT spin. You can tell by the amount of "coming soon" and beta models. Half the planes don't even have correct hitboxes. This is ontop of the 200ms, terrible registry, and other bugs that take away from gameplay.
With all that aside, it's a fun game if you look past the issues. It really is World of Tanks with planes...........imbalances, bugs, and all. Personally, I can't see someone putting money into this game. If I told any of my friends I put money into a F2P where I got a "monthly" account they'd probably laugh at me. Some of the Freemium planes are a bit retarded, too. To each their own I guess.