While I have a couple Gen 3 19's, Ive never been a fan of the 19's in general. The finger grooves arent an issue, but the grips are a tad short/cramped for me. I had a couple of early 19's that had the cutout in front, and that only made matters worse, and were even more annoying. I cant imagine the Gen 5's are any better because of it.
Personally, I think if Glock had just removed the lower bump on the grip of the Gen 3's/4's, it would have been the best choice. The 3's are much better feeling without the cutout, but that bump is still in the same place, and a bit of an annoyance.
I also have a couple of RTF2 17's, and think that was the best finish Glock has come up with. Wish they still offered it as an option. Those that have that finish are the only Glock grips I dont stipple.