I am in the process of searching for a set of Callaway Apex 19 irons with Nippon Modus3 Tour 105 stiff shafts. They are difficult to find, and I have thought about considering and have been offered an Apex 19 Combo set (4-7 are Apex 19s and 8-AW are Apex Pro 19s) with that shaft. I have hit the Apex 19s and am very comfortable in getting these, but I have not had the chance to hit the Apex Pro, so I am very hesitant. My main question is for those who have hit both or have a combo set, what are the similarities and differences? How much harder are the Pros to hit? Is the technology in each similar enough so they go similar and consistent distances and ball flights? Any thoughts and ideas are greatly appreciated!