For several years I too was a pretty big KT fan. I had 5 or 6 different KT handguns (now down to just a P32 my wife claims), but only 1 "long gun". I had a slightly used Sub 2000 (9mm with Beretta grip) that was just downright outstanding for a pcc. One of my best fishing/shooting buddies had a Camp 9 that got a little ballsie and challenged me at the range thinking he'd shut down my affection for the KT S2K. Ha! He lost that bet in a big way. I think he traded that Camp 9 the next week.
There's no doubt that the KT products are just a little on the "rough side", but George Kelgren (Mr. Kel Tec) is really one hell of a designer. Unfortunately, maybe not so great at protecting his product designs. Since I'm also a Ruger fan, I won't dredge up the issue of the Little Copy Pistol (Ruger LCP).
Actually, I have no real practical need for a 9mm ammo blaster, but the KT S2K would be my choice. A few years after trading the S2K, I got the itch again and bought a Beretta Storm. Very well made and about twice the cost of the S2K. Bummer .... my old S2K was much more accurate than the Beretta - even with the cheesy pink mylar front sight blade.