I tried a pair over the weekend with a Geforce 4 ti 4400 card.
They are kinda picky and after messing with them for about 6 hrs, I took them out. You have to kinda set a focus point for the effect to reference from. But I couldn't get everything to focus in. ie if the gunsight was in 3D, the instruments would be ghosting badly and when the instruments were good and sharp, the gunsight was out of focus to the point my aim was off. For just flying around and lookin - it was really neat. In the 110 the back view felt like you were looking down a long hall. You got the feeling of 3D - alot.
The refresh rate has to be over 100hz which limits some monitors resolution settings. Even at 120hz running 1024x768 I had an annoying flashing about every 20 to 30 seconds.
neat experience, but created more trouble thanthey were worth for me
think they are only $30 now, so give it a go. Your experience may differ