The Shield is compact, reliable and is rated for +P ammunition. Mine has never malfunctioned and I have never seen one malfunction. I like the thumb safety for IWB carry. Heinie makes a set of his excellent "straight 8" tritium sights for the Shield.
You won't go wrong with a Shield.
Exactly my experience with my Shield 40S&W. The Heinie Straight 8s on my Shield are the fastest tritium sights to acquire I've used.
BTW adding the Apex deuty/carry action enhancement kit & trigger is worth every penny.