The same ejectors are used in the CS45 as are used in many of the other S&W pistols (such as, for example, the 4506 & 4566TSW, to pick a couple of them). They aren't exactly what I'd call 'flimsy', either ...
The only ejectors I've had to replace in the last several years are those older ones used in the early 3rd gen production, which had shorter tips and had a sharply angled cut on the bottom ... which could creat the potential for a stress riser to occur. The newer production parts not only had a curved angle replace the sharp corner, but they extended the tip, which provided for faster ejection.
Anything can break, especially if damaged or abused, though, but it's an easy & quick replacement for a gunsmith, technician or armorer. No fitting, just a bench function check for proper fit & movement and then test-fire.
If you want to read some history, and some owner's experiences, why not also try the S&W forum, under the Semiauto Pistols section ... and do a search for the CS45, as well.
http://smith-wessonforum.com/eve
I've posted a response or two myself, from time to time ... and even in THR and GT, perhaps.
The CS45 is a nice subcompact 6+1 .45 ACP. I've had one for several years (although mine has been converted from Safety/Decock to Decock-Only).
Mine has had one of the previous Ashley Big Dot sights, when they only offered the tritium capsule in the front sight for the CS45-specific rear sight. At one time or another I've also installed an adjustable rear sight in another guy's blued CS45 (why, I don't know, but he asked for it), as well as a Novak Ghost Ring rear sight (before they were produced with the single tritium capsule at the bottom of the dish-shaped rear sight opening). That Novak Ghost Sight rests in my 4513TSW at the moment ...
A couple of minor things occurred during the production of the very early models, which were addressed ... involving a bit of a tight tolerance in the barrel tab/breech face of some of the early pistols, and some of the early magazines regarding the added secondary dimples on each side of the magazines below the lips, before they were done by machine. Easy factory corrections & magazine replacements for any affected early pistols, though.
The current CS45/9 have ambidextrous decockers and regular Novak-style 3-dot sights (versus the single sided safety/decocker levers and the plastic sights). The recoil guide rod plunger plunger changed, too, I believe, although I tend to like early plastic plunger, myself, if only for ease of disassembly when removing the slide stop lever ... and reinserting it.
They should come with 2 magazines for commerical sales, and 3 for L/E sales.
Great little guns. I prefer the CS9 over my CS45, however, for overall size.
As with any of the smaller framed subcompact pistols, though, I tend to replace my magazine & recoil springs a bit sooner than I do with my larger framed models.
Also, as with some of the other really small-framed .45 ACP pistols with reduced slide mass and increased slide velocities, the faster cycling and .45 ACP recoil impulse requires a good grip technique ... and any tendency or inclination to use a relaxed grip and/or unlocked, less-than-properly-firm wrist may possibly contribute to the function issue often called 'limp wristing'.
