KTOG is the king of Kel-Tec product forums. You can get all your basic questions answered.
The general rule with Kel-Tec guns is that they are innovative, original, spartan, simple, effective, reliable, kind of ugly, and those who like them really like them and those who dislike them probably never actually fired one.
I have a P-32 and a Sub-2k. They both exactly meet the description above. I can't actually speak directly to any of their other guns.