I bought the Shield 9 about a month ago for CC and fell in love with it. The PX4 was a really nice gun but I have to admit...it was no M&P! I used the Beretta mainly for HD and range fun. I felt it made sense to have the same battery of arms for both. My new baby is at the gunsmith for Trijicon HD sight installation. Can't wait to take her out for a test drive!