Flyers are a necessary complement to Playstation car and racing games. This type of games are playable from a normal controller, but the difficulty of this type of games, which is already great, increases a lot.
There are different types of steering wheel, just like there are Rally or F1 games. There are some play 4 wheels that can be used in ps3 thanks to a selector.
In addition, there are different types of flyers or accessories for them. Some include a gear lever and others with 2 or 3 pedals.
Of course there are different flyers with different prices, but some are cheap because they are for beginners or because you can find good offers on Amazon.