I had the 9mm glock version for a few years. I always had a great time with it. Shot it several times at FNS with great results. I had the glock 33rd mags for it and never had a problem with them. I agree with indykid get the rubber bumper for it. Even the 9mm will beat you up after a long session. You won't be able to lock the bolt back though but having one will be worth it.
Very low sights make it difficult to get a good cheek weld. Pretty accurate out to 100 yards or so...makes a perfect travel gun, I carry mine in my backpack.
It can actually put a bruise on a check, but it folds to fit nicely a lot of places.
You might want to check with Bradis Guns. They had both when I was there a couple of weeks ago. Those will be long gone, but they may have more.
Someone tried to get me to shoot one once but I could run faster than they could.
That particular one couldn't get on paper without breaking loose the front sight band and resetting it properly centered. But that is par for Kel-tec's course.
It does fold in half though.