I am reviving this long-dead thread to report that I finally received a proper, undamaged Shield 9 RSA a week ago, only two weeks later than promised. It took 3 1/2 months and two failed attempts by S&W to replace it following the purchase of my Shield. (Read above for the whole strange story.) When I installed the new RSA, I had no trouble racking the slide and engaging the slide latch, and the front retainer disc was firmly attached. I went to the range yesterday and fired 155 rounds, mostly Lawman 124. When I got home and removed the RSA, it was actually intact and unbent.
While my Shield generally performed well, I was disappointed by two FTEs. That brings my Shield's total FTEs to 11 in 1820 rounds. As a result, I am still carrying my M&P 40c. I will not consider using the Shield as my EDC until it can go at least 500 consecutive rounds without any malfunctions. Because both FTEs occurred early in my range session, I'm hoping that they were a function of the RSA's breaking-in process, and that they will disappear in the future.
For those of you awaiting a Shield RSA, be patient. S&W will get one to you. Eventually.