I don't have a Pro but I do have several 1.0s.

The "strong" vs "weak" are most likely due to what ctr1970 has already said. The chassis embedded in the frame was extended into the dust cover. This would make the frame more rigid. How much of a difference does it make? I have no idea and I have seen anything that quantifies it.

But the 2.0s have other changes. The trigger has improved, the slide lock now uses a detent, and the grip texture in more aggressive.

I have a 5" CORE slide kit on my FS. I also have a bunch of 2.0 backstraps. I prefer the CORE. I also dropped a 2.0 trigger group in my 1.0. I like it.

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