I'm not ashamed to say I've spent money on this game.

I spent 8 bucks after a couple hundred hours on an XP-50. Its insanely cheap to fly with a fat reward multiplier.

The 8 bucks let me relax and forget about the grind, which ultimately made the game more fun. I have yet to unlock any jets despite being on my way to 300 hours but I'm fine with it.

The way the planes handle in this game is just so satisfying. The sim mode isn't as serious as other sims, but I think it strikes an excellent balance of control and fun with control.