I have a few questions. First the one I am get a great deal on has a safety. I don't want one but it has it. If I but if for my wife can just leave it on fire and still load and unload etc without turning the safety on or off? Also what is different about the trigger vs a standard Shield 9mm?

I've had my PC Shield for over a year, haven't touched the safety at all so has not affected my shooting, reloading, etc.

As for the trigger; the PC's come with a different sear as well as what SW calls an enhanced trigger. I've noticed a slight difference vs a std Shield but could not explain mechanically the what and why of it all.

well over 1k rounds non mine and I love it. I'd only add it will get dirty due to porting; and there are some manus who state their range ammo should not be used in a ported barrel (due to thin plating). Usually the boxes are labeled as such. Just something to watch for, if its of any concern.

You can remove tha safety.

M&P Thumb Safety Removal & Plug Install - YouTube