In the beginning I was not wild about the grip sleeve in concept but I have to admit, the comfort is insanely good. I also had a mixed experience group on the range today and bar none, everyone's very first comment was "wow this is a really confortable gripI also used it to teach proper grip, again some folks with experience and some folks with none. Today being their first time shooting.
The gas pedal, and again, say what you want to but this little gizmo does exactly what it was designed to do. Secondly, it worked great as a reference point when explaining where the support hand thumb should rest.
Long story short, using the P320 as a teaching tool, I was able to get the participants , even the ones with no previous shooting experience, to sucessfully hit 12oz water bottles at 25 yards.
The gas pedal also helps to correct pulling left. So bottom line, this set up worked flawlessly.