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I concur that the early problems of Gen 4s have been corrected. I own Gen 4 versions of G34, two G17s, two G19s, and one G26. None have had any issues. I never purchased Gen 3s because of their large grip hump. It did not feel comfortable to my hands.

I like the Gen 4s for three reasons:
1- more ergonomic grip (hence less hump)
2- the beaver tail backstrap option, and
3- the better grip texture (gives me more traction on the grip)