I believe they have both problems fixed at this point. I have seen a couple M&Ps with thousands of rounds through them without any FP hole problems. The front sight issue seems to have been limited to an early production run, and I have not been hearing problems of the more recent guns.
I had a couple in here yesterday with loose front sights and the dovetails had a channel through it as though the cutter they used to rough the dovetail was set deeper than the final dovetail cutter' sure would make it easier to shoot loose. I just replaced them with speed shooters specialties F/O sights, roll pinned them in place and sent them back to the owner. Shouldn't come loose again.
Dan