This game is fun an additictive an there is content for all level of gamer which is great since its just an arcade game.
At first there is little flying things everywhere and its all a little confusing and i'd advise going with the adventure story first.
Asides from the two campaigns there is at least 10 scenarios you can play for some more achievements also you are awarded medals for the speed you complete the levels and for those of you that want to compete online with one another there is a leader-board that holds scores.
Sum up - For the amount you pay you get so much even if you try it and just find its not one for you you really wont have lost alot but i doubt that will be the case.