It takes about an hour or so to put on, the mounting brackets are most of that.
It pretty much stays on, you could take it off but that would leave the brackets showing.
It is probably the best wind protection available at any cost, better than any windshield bar none. You can also buy different height replacement screens that are taller if you need that.
It is very sturdy, I don't see why you couldn't mount a GPS on it, along with just about anything else.
Corbin is busy in the summer... They probably are backed up...
I have some pics in my photo album of my black one... they are nice.