Carried a Shield gen 1 for many years before getting the OSP. I carry a 13 round in the gun and two 15 rounders on the belt. With that kind of capacity, the extra inch of barrel is a nit for me. Got the RDP for the wife. Found out that she is more accurate with the RDP over the OSP. While the PRO is a very nice gun, I see no reason to spend more money on it considering that I can hit a 3 inch bottle cap at 30 yards with the OSP.
Now, if they came out with a Hellion in .308, that might be a different story.