I don't own one but had a chance to shoot a 9mm PC Shield.
First off, I REALLY don't like the ported barrel. I didn't shoot it at night so I don't know if they flash badly at night or not, but I REALLY hate the additional noise. I have a good set of regular ear muffs that I have used for years. I have shot rifles, pistols, shotguns and been around a couple of M2 machine guns at an MG shoot several years ago. These muffs have always worked very well. The ported Shield left my ears ringing, even through the muffs. I couldn't believe how much extra blast came out of the ports. I can only imagine how bad it would be without them if you actually had to use the gun, I know, a little hearing loss is better than death, but if it does this, it would make it harder for me to practice with it. Additionally, although I didn't shoot any +P defense ammo, the porting didn't feel like it did anything to me beyond a standard Shield which I do own.
Myself, I didn't care for the fiber optic sights. I could take them or leave them. I shot the gun in somewhat overcast conditions and the sights just looked like colored dots. They didn't seem brighter than regular, painted colored dots at all. Not a big deal and I could live with them if everything else was good but I wouldn't pay extra for them. The gun was used so possibly the fiber elements were dull bit I wasn't impressed. They worked pretty well as regular sights, though, and were tall and easy to see.
The trigger was amazing. Quite a bit lighter than my regular Shield and the reset was very distinct, both audible and tactile. I really liked the trigger. Not the best trigger I've ever encountered but one of the better poly framed triggers I have shot. I liked the trigger enough that if S&W would ever offer a PC Shield without the ported barrel, I would snap one up just for the trigger, even if it did have the fiber optic sights.
Bub75