We just saw a Medusa demo and Age of Empires with 3D stereo, and we can tell that you it looks awesome.
You need a few moments to adjust your eyes to it, but it does looks great. It is better than 7 years ago when we first saw a similar 3D stereo technique.
It is back and it works well. 120Hz displays are coming out very shortly at almost no big price difference and they will be able to work as 2D and 3D monitors.
Nvidia was lucky that this happened at this time, as this might push SLI as you need a lot of GPU power to render two pictures that you need for 3D stereoscopy.
The only issue is that you will get a headache after playing for a few hours; but it does get games to the next level.