not very useful now and maybe will never really be useful.
Think about it...it's a physics card. Using a simple example, it makes a falling box, fall more realistic. I admit, I have fun looking down at a pale and kicking it about...but that's about it.
And yes, on an order of magnitude...say a brick wall where the bricks demolish realistic...that's about it.
It's gimmick and novelty in my mind, but if you'll buy one of those "extreme" nic cards to get the gosh darned best network performance from games...you might just buy these
all in all, techinically they work...calculations offset due to mundane purpose can increase overall performance.
If you're rich get one. If not, buy a next gen console to supplement