I also bought this controller as an addition to a new PS3 with GT5 Prologue pack.
It didn't work with the game, as the previous poster states, so I took it back and swapped it, thinking I bought a faulty one. Turns out the second one didn't work either.
Turns out, despite Logitech being involved in the production of GT5 (you will see the Logitech sysbol in a start up screen!) - the controller doesn't entriely work.
Logitech themselves don't not have an explantion/excuse/reason on their website.
Don't buy it and pay the extra for the Sony original.