I have only had the app for 15 minutes and it has already proved itself to be fun, bug-free, and sooooo much fun. If you crumble under stress easily, this game is not for you, because sometimes it gets hectic and stressful in a fun way. It is very stressful to operate a control tower. But if you like games like this where strategy and thought is needed, you will love this.
P.S I am not judging this off of 15 minutes of experience. I played this with my friend many times before getting it. And it is still as fun as it was when I played it with her. I hope you get and love this game, because it is ultimately worth your time and money. Don't get the free version because it has in app purchases and ads. But the payed one doesn't have any in app purchases or ads and is simply hours of fun, addictive gameplay. Take it from someone who knows. It's worth it.