My favorite sim by far. A little rough around the edges and can be daunting for new players, especially if they are from Forza or Gran Turismo. It also being just GT cars can also be a turn off for some.
However, if you want to enjoy a real life simulator with some of the coolest cars ever made, it's bliss. The learning curve is steep and there's stuff you'll probably have to look up like engine mapping or TC.
DO NOT SPEND MONEY ON SETUPS. DONT. DO. IT. In game setups are fine and if you take time to practice, you can figure out your own.