Works just fine.
I used this cup with this,http://www.backcountry.com/gsi-outdoors-collapsible-java-drip#review_200078695 to make coffee. I was worried that the weight of the coffee make filled with water might cause this cup to collapse to its storage form. No problem though it worked just fine. And as a bonus you just about fill the cone of the coffee maker up with hot water and fills this cup just right when it drips down through. (Might have to add a bit more water.)
Real easy to clean too.