I just finished Mirror's Edge in 3D.
I wrote a review about it and let me write down my 3Dvision experience from that review
3DVision : Mirror's Edge is rated "Good" by Nvidia and I agree. The game could have been great in 3D, but I experienced few problems. Mainly shader issues, ghosting or wrong rendering of the objects, however when I switched to Directx10 via the .ini file of the game, the experience got better. It could have been an even greater experience but many small annoyances ruined it at times. However if you have a 3D setup, you should give this a go in Directx10 mode.