iScope iPhone adapter

It is an adapter that attaches to your scope and lets you use your phone to look through your scope. Just wondering if anyone here has used one of these for their spotting scope. I think it would be great to use in practice and some matches. I know from first hand experience that Camp Perry does not allow phones at the firing line, even for a timing device.
Here is a link to it.

I've seen the ads, but I have yet to see one in use. It's a great concept though. With the video record feature, it could make some good videos.

YouTube AMU Pistol Rapid Fire