ED Glasses?

I am thinking about getting those ED Glasses that let you play the sim in 3D. I have been making Anaglyph images (Anaglyph is where you ware the re/cyan glasses) to make 3D Images. needless to say it is cool. So, my question is this. Does the ED Glasses Really produce the depth that my anaglyph images produced? If you have these and use them please tell me how you like them, I just don't want to waist my money.