I love this concept and would like to try one at some point. ( saving my change )
I a do agree it doesn't seem like it is the PERFECT blind for all conditions but quiet a few yes.
( not on windy days, not on super bright days)
I have been searching my local thrif stores for the materials to build my own. i know some of the cheap door mirrors sold at department stores are plastic ops to glass and quiet flexible and light.