The Swartz type safeties are firing pin safeties that are unlocked by depressing the grip safety. Currently, the S&W 1911s and Kimber series II guns have Swartz safeties. The problem that can occur is when the timing of the grip safety releasing the firing pin lock is after the grip safety releases the trigger bar. When this happens, the hammer falls but the firing pin safety still has the firing pin locked. You get a click instead of a bang. Part of this problem is also due to tolerances and slop, you could depress the grip safety one way and the gun will go bang, then you depress it another way and it goes click.
Not all Kimbers or S&W have problems. Many if not most run perfectly well, but enough of them do have issues that problems are not uncommon.
My personal preference is I don't want to risk a carry gun going click instead of bang, I will not buy a gun with a Swartz type safety. The Colt series 80 safety is entirely different and does not suffer from these potential timing problems.
Not all Kimbers or S&W have problems. Many if not most run perfectly well, but enough of them do have issues that problems are not uncommon.
My personal preference is I don't want to risk a carry gun going click instead of bang, I will not buy a gun with a Swartz type safety. The Colt series 80 safety is entirely different and does not suffer from these potential timing problems.