So I played some JK 2 SP with the Logitech Ifeel mouse.
Wow - really has a great effect, you can feel everything and it doesn't get in the way of your aim whatsoever.
It really makes the game more immersive.
I had the same result playing Tribes 2 as well.
I read that SOF 2 support it as well, so that's worth checking out.
You can get one from Logitech or Amazon.
I also noticed the mouse is about 5 - 10 times more accurate than my Microsoft optical mouse - not sure why that is, but it makes a big difference in gameplay - Logitech is win.
I highly recommend this mouse.