Thanks Dan thats interesting. Can anyone put any further input on the longevity of this gun? Or other polymer based weapons?
The current P07s are good to go in terms of the frame.
As to the durability of the guns... There are at least 2 Glock 17s I know of that have over 1 million rounds through them (frame and slide are original); I'd say that's pretty durable. There are a couple polymer framed HKs with pretty extreme round counts still going strong as well.
The polymers used in both the M&P and P07 are extremely durable and you'd have to spend thousands (maybe tens of thousands) of dollars on ammo before you'd see any issues with the polymer losing strength.... I doubt even then it would though.