I had one, liked it, and miss it now. Between the fixed barrel and SA/DA trigger, it is a very accurate gun. The weight makes it easy to shoot all day long if you want.
However, in that size and weight of gun, you give up a lot for carry purposes. In a smaller/lighter package, you can get a lot of .380s and 9mm. As much as I liked the PPK, I like my Shield 9 more. For summer, the PPK is a lot harder to carry everyday than my TCP.
Just to have, the PPK is a great little gun.