I have, it's the only way to enable PS3.0.
Took quite a bit of tweaking to install it and enable the PS3.0 path in Farcry for 1.2 patch.
Definitely not "out of the box performance" lol
I got mine with the Service Pack 2 RC. But you don't really need it unless you have a 6800. If you do, this thing really boosts it's performance, along with the new drivers.