I have a K-9 and a K-40. They are good quality, accurate pistols. The downside for me is that all Kahrs are built for small to medium sized hands, and mine aren't. The trigger reach, combined with the way the trigger hinges, makes them ideal for people whose hands are small enough to take advantage of that feature, but make them more difficult for people with larger hands or longer fingers.
I have owned eleven Kahrs and still own five, one of which is a K40 Elite '98 (all Elite series are stainless steel). It is a fine gun and a good one for closer/deeper concealment. It is a little sensitive to some .40S&W defensive ammo* but has fired everything I have put through it. I replaced the stock hard rubber grips with the smooth wood so it works better with a felt-lined jacket and rugby shirts.
I can offer more information if you like.
* When unloading and removing a Federal HST round from the chamber, you have to really make sure the slide is fully retracted to free that round up so it will drop out of the gun.
I have an MK40 all stainless. Nice well made gun, no issues. SouthernBoy is correct you really do have to rack that slide to manually eject a round. However, it never effected the gun from functioning.