Do you want to take the risk of wasting your money?
Bought the game a few hours ago and downloaded it right away. Well guess what? Steam has ♥♥♥♥ed me over really good this time. I get an error message that says "The application is currently unavailable." I've tried everything besides contact support, which I will do next. All my drivers are up to date and I meet all the system requirements. Don't throw your money away through Steam.