S!
Mere gimmicks to me. I will look into it when EVE Online will get the new physics system that possibly uses PhysX or something..but not in a couple of years. For me the game and the plot, how it is done is more important than see a flag waving or some pieces of rock fly around and bounce like they are weightless as usually the ground in games is solid and does not give in as IRL.
And you can use AMD + PhysX..just have to use drivers that have been "enhanced" to bypass the nVidia's code.