FYI... All of the Parker horns have a lifetime warranty. When mine went, I sent an email to the company (the horns are now made by an Italian company... I'd have to check the horn for the name). I got a response about a week later from their one of their U.S. reps. He sent me a brand new...
I would imagine that they are demoing the 7" unit because it is the only one that is currently available. The 12" unit isn't being shipped until (allegedly) December.
With regard to the comment that touch screens are "gimmicky"... Perhaps that could have been said ten years or so ago, when...