I liked my M&P 9mm. When an opportunity came along for the M&P in 45, I said yes.
My M&P 45 came with no backstraps, but my extra 9mm ones interchanged easily.
Accuracy is good, feeds my 200 grain cast & my 190 grain Top Hat bullets easily. Mild recoil, decent sights, & gun handling characteristics put many other 45 autos to shame. Easy to swallow price too. I actually like it better than my G21. You will not be disappointed.