I have some of these, which are basically the same thing. I haven't used them in a few months, but they were pretty kewl, I'd say. One thing that was a little annoying, and I don't know if this has changed, is the drivers that had the support for them were pretty outdated and I didn't want to take the performance hit by using the old drivers just to gain the functionality of the glasses. That's not their fault though. Now I don't even have a Windows machine at home, so they're sitting on a shelf.

Oh, another thing is that they take some getting used to. They can give you headaches very easily, and you have to train your eyes to be able to relax with them on. Only took me a few hours to do this. Most importantly, there are some people that can't use them at all. My sister tried to use them a few times and just couldn't see the 3D effect at all. Basically, if you can't see the stereographic images (stereograms), like the ones here, you won't be able to use the 3D glasses.