If you like the LCP because of the size and weight, then you should like the Kel-tec 3AT even more as it is smaller and lighter.
I only need a light weapon for pocket carry. I carry a S & W 340PD. At 12 ounces it is light enough for pocket carry, and in the year or so that I've owned it, no one has ever noticed it in my pocket. And it carries grown up caliber ammo (.38+P and .357). And it is more reliable.