I've never heard of them before. Has anyone else? They are from the Czech republic, wonder how long they have been around (I e-mailed them back to ask).
Interesting. If you look on the "which size" page it shows a picture (computer generated?) of them, and it says they are white... so I'm thinking not clear silicone like the other cups, but opaque perhaps.
EDIT -- They are sending me a sample, so I'll keep you all informed on how it goes. They started selling them in "january 2008" - so very new.
And I've given them some suggestions for rephrasing things on their website (the "roughened", "bursting" and I suggested calling it a "stem" rather than "holder" and "handle".)