I have nearly 8,000 rounds through my Shield 45. I like it a lot, and carry it often. I wouldn't do so unless I found it to be both accurate and reliable. Here's my report:
Shield 45
Purchased February, 2017
Round count: 7,661
Accuracy scores (Percent of shots from my last 15 range visits that hit inside a 4"x 4" square): 15 yards, 404/565 = 72%; 20 yards, 369/728 = 51% These were taken two-handed, standing unsupported.
I bought this Shield because of the many favorable reviews on the Forum. I love this gun. It's easy to carry (I carry it in my right front pocket in a DeSantis Nemesis holster), its recoil is surprisingly mild, and its 15-yard accuracy is astonishing. The attached target photo shows one of my better days at 15 yards (40 rounds) with my Shield 45. I can't believe that it is so accurate with such a short barrel. It outshoots ever other pistol I have, including my SIG P320 compact. The only exception is my FNX 45 Tactical with its 5.25" barrel and Vortex red dot.
I did have the original magazine followers, so I had a bunch of failures to feed initially, but after I received the redesigned followers, the FTFs went away, and it has been very reliable since. The factory trigger is just fine with me. While it is not as good as the excellent trigger in my P320, or the single action of my FNX, it is good enough that I've never felt a need to replace it.
I added a Hogue grip which has helped to improve my accuracy. My main challenge is shooting one handed. The combination of a small gun and a big round means you need a very firm grip and a firm trigger pull, or you'll limp wrist it into a failure to feed. But those have diminished with practice. Overall, however, I have no reservations about carrying my Shield 45. Even though my M&P 40c usually gets chosen for my daily carry, it's because of its greater round capacity, not because of its greater ability. Anyone considering the purchase of a standard Shield should consider the 45 first. It is superior to the 9 in every way, except capacity. And to me, it's worth giving up one extra round for the superiority of the 45.