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Dave, I would suggest replacing the remaining half of you ambi-safety with a traditional, one-piece, single-side thumb safety if you aren't going to use the ambi-safety. It varies from one gun to the next but having only half a shaft of the thumb safety in place may cause the grip safety and firing-pin block(Kimber Series II or Smith&Wesson's) to function improperly.

I bought two of the Kim-Pro mags. I have rounds repeatedly nosing over and ramming the bottom of the feed ramp rather than cycling normally. The base pads had to be trimmed to clear my S&A magazine wells. If your S&A is thoroughly blended with the frame on all sides, this isn't an issue.

I've only put a couple hundred rounds through the new magazines. So, I don't yet know how the lips will hold up. In hard use, I end up replacing Wilson bodies or sending them back to Wilson after 8-12 months. I've only had the Kim-Pro's in service for a couple months...Time will tell if they last as long as the Wilson's.

I can say the catch ledge appears to be slightly lower than is the case on the Wilson. The result is the magazine wants to sit higher in the gun which should promote better feeding, yet the rounds still nose over into the bottom of the feed ramp. I also noticed it's REALLY hard to eject a fully charged magazine if the slide is down on ALL my single-stack 1911's with this magazine.

That's all I can add for now.