Here's my hat in the ring: Kel-Tec seems to be similar to Taurus in that it has its goods and bads. They are an innovative company. Just look at the variety of guns being produced and see where anyone else is doing it (ok, in the case of the P3AT, many people). Kel-Tec builds a product that sometimes lacks the fit and finish that a firearm being sold should have, and you'll often have a pistol that needs some "fluffing and buffing" (removing burrs, sanding down some of the rails, etc.) People either like them, or hate them. I fall in the former camp, but in the interest of full disclosure I have had good, and bad experiences with Kel-Tec.
First the bad:
Kel-Tec P-40, probably the most unreliable most painful handgun I have ever shot. With the attrocious DAO trigger pull, the constant jams and failures to feed, and this being the only gun that would bruise the webbing in my shooting hand, I eagerly sold it to a Kel-Tec Collector and I can see why Kel-Tec discontinued this gun.
Now the Good:
P3AT: Wonderful little gun, something like 8 ounces unloaded and I'd actually forget that I had it in my pocket. Mine ran every kind of ammunition and was reliable without the fluffing and buffing that you do see "needs" to be done. This is the perfect little BUG and has helped launch a mirco-gun production revolution where Kel-Tec is being pressed for the marketshare. Sold it when .380 ACP ammo dried up, been regretting it ever since.
PF-9: Wonderful little gun. A shootable, inexpensive pocket 9MM pistol. This shares the same kind of DAO trigger that the P3AT and P32 have and not the P-11. Put 600 trouble free rounds through mine. I miss it and I regret selling it to fund another venture.
SUB-2000 9MM rifle (Glock 17 variant). This one is set up to take Glock 17 pistol magazines. It's fun, easy to shoot, somewhat cheap to shoot (except if the 31 round fun stick is used) and folds up nicely. Aside from cleaning the bore, I haven't disassembled it. It digests everything from Wolf ammo to the hottest +P+ ammo. This is the only Kel-Tec currently in my inventory and it will stay simply because no one else makes a rifle that I can fit in a duffle bag without some silly NFA stamp.
As with each company, you will have plusses and minuses. Kel-Tec is no exception. What is likeable about the company is the way they make products that no one else does. They own a solid percentage of the Concealed Handgun market and have spawned other companies that have decided to get into the game.