I am far from closed minded. I flew (state) pattern for many years with a battery sloidered to a glow plug clip. In all of the contest I was in, the glow plug never cost me points in a flight.
And at one time people lived in caves and used rocks for hammers. They worked perfectly for thousands of years and were free for the picking up!
Elitist I am not. Some people on this thread did not understand the application of this piece of equipment yet were still critical of it. Not exactly an open minded attitude.
I do not have a use for it but I am always interested in new stuff. It is called learning about things. I have now learned that there is a "New" Pro-Driver 111. In light of what has gone on before it is hardly likely anybody will take the trouble to describe it here. IS IT?
Ed S