Definitely agree about the serrated trigger, but overall I’m very pleased with my 43.I like the changes in the 19x. The did away with the trigger spring and the round firing pin safety plunger on Gen 5's. I like the magwell too.
I have a gen 3 19 with a lot of rounds and no issues but I hate the serrated triggers on my 43's. I smoothed trigger face down a dab.