I'm the contrarian here. Have owned and shot many .45s over the years. 3-gun bullseye shooter in the Army.
I bought an M&P 45 on an impulse, after handling it in the shop. It felt great. My normal breakin routine is a couple hundred rounds of WWB.
After that, I compared the M&P to my 1911, Glock 30 and S&W 645. With factory loads and a variety of my handloads, the M&P was the least accurate of the group IN MY HANDS. Not by much, but consistently last place. Put in the Apex kit, which improved it a bit.
Never had a function problem, nor have any of the others, for that matter.
In the end, I swapped the M&P for a nice Model 681.
So, all's well that ends well.

Now, If I could just find a PC Model 845!

My $0.03, YMMV.

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-jwk-
US Army '72-'95