On the trigger if you hold your hand out like you are holding a grip frame and pulling he trigger i think you will notice that you index finger moves more than your middle finger. You index finger is better at moving more forward and you middle finger stays more gripped. So the trigger moves out in the middle.
However we have had enough comment that we may have less curve in the bottom half to bottom third - so it pulls the same but looks different.
Similar to how we designed the trigger guard.The front grip is thinner than many front grips. The distance to the guard is then set so that you wrap your fingers (not fingers and palm) around the front grip.
When you have your fingers around the front grip - index finger around front cap, your palm will then naturally rest against the trigger guard. When you shoot - a player will normally have a tighter grip on their front hand and a looser grip on their back hand. The front hand's - finger and palm - then pushes the grip frame into you back hand. This gives you a more controlled grip than a post grip.
IMO it's way many player like to hold onto the barrel of spool guns, not just because they can - rather having one vertical grip and one horizontal gives more control.
Nevertheless I feel that the finger grip and palm press is superior to the barrel and frame grip.
Double stacked players like the Deception grip right away, some spool players have become very used to the barrel grip, so unless they really give it a try they prefer the barrel grip .