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I have a Kel-Tec Sub in .40 S&W.
The model I have accepts Glock magazines. I use 15 round mags with a two round extension. There are other models that accept S&W or Beretta magazines. That's an advantage if you want to have a companion pistol and magazine interchangability.
The Sub folds down quite nicely and is easy to clean and maintain. There are a number of inexpensive aftermarket accessories available for it. I have a buffer spring tube cover that helps a little with cheek weld and I installed a buffer that definatly dampens down the recoil. One caveat with that is the bolt hold open notch then needs to be modified; easy to do with a dremel tool. I found the Kel-Tec sling to be fairly useless except for one time when I used it in a tactical match.
I opened the rear peep sight a little as my eyes are getting older. I'm not real thrilled with the plastic blade front sight. That will soon be changed for an aftermarket AR-15/M-16 style post sight.
It is accurate enough at carbine ranges and I have never had any problems, FTE or FTF, with any ammo I have used. The manufacturer warns against using aluminum cased ammo.
Although I have never needed it I have heard Kel-Tec's customer service and warranty policy is outstanding. I have had it now for about 2 years and I am glad I bought it.
DocV