I use the SW9VEs as primary trainers and have had ONE problem, ever: one magazine was bad right out of the box, mis-cut mag catch slot. S&W replaced the magazine free, of course.
The stock SW9VE is extremely reliable; most of the popular mods compromise that one way or another, particularly with high power LE ammo.
Put the M&P 9Pro trigger in it, and it would be ideal; wait, I can just buy the M&P if I want that trigger, can't I?