I personally cannot sell you on the teflon folder
because I don't have one (yet).
However, these teflon folders have been recommended on some online classes by people respected in the industry and whose opinions I value. They say that these folders don't leave a shiny area on the cardstock. And I know what they're talking about there because I get the shine with my regular bone folder, and I don't like it one bit !
I am thinking about getting one of these puppies....