Saw a pair of Wiretaps at the store the other day, and will keep them in mind for getting 'scrip lenses for in the future. Have a question though, are the lenses changeable/removable? Like Flaks and Half wires? or are they 'permanent'? One reason is that I can order through work and get a great discount on the frames, but that only works if the lenses are removable. I did that with a pair of Boomstands I had for normal 'script glasses. Thanks!!