I rented a G19 a few days ago at a range I noticed as I drove by. It was a Gen 4 though.
The finger grooves exacerbate the Glock knuckle. And I by far prefer the Straight 8s of the stock sights. Trigger didn't seem different though.
I HATE the finger grooves I cant wait to send my new frame off for them to get removed and the double undercuts.
And yea I am going to be that guy who has the stock sights on for a bit. I have some nice Wilson combat Vickers elite battle sights. But they are on my G17 and my local shop would switch them over but dont have a way to sight them in is I'm just going to handle the stock junk until u send the slide out for an RMR