The idea is simple yet brilliant, and you WILL use this. One caveat: PRACTICE! While the handling
is straightforward, it is NOT “automatic”. You must pay attention to your handling or risk exposing
everything. Not particularly angle sensitive (175+ degrees), but stuff can move around on you.
Also, it can break DURING performance! The simple cure here is maintenance before every show.
Easy but necessary.
All that said, I LIKE this device.
(Perhaps of even greater
value here is the knowledge to make your own out of other things, for example a real postal envelope
or different colors or custom sizes. Very useful information.)