It's an ok FPS, but the progression system is very bad. Weapons cost a lot, and even after you buy one you'll have to spend 3x the value of the gun in order to customize it (and there isn't much to customize, by the way... Just the magazine, barrel, and sight). You'll need to level up in order to unlock guns and their price gets progressively higher, the first gun in each category will be very affordable but after that things get very expensive.