The question is .......WHICH PPK/s?
There are at least 4.
The first two are the European made guns.
One is marked "Walther Made In Germany" and the other is marked "Manurhin made In France" usually with "Under License".
You'll hear people saying that the French made Manurhin is OK but the Genuine German made guns are the best.
The truth is, after 1945, just about the only Walther PP series guns made in Europe were made in France by Manurhin FOR Walther of Germany.
In the 1950's the world wanted to buy Walther PP series guns, and Walther had no production plant.
So, they contracted with the French Manurhin company to make the guns under license.
After Walther built a plant, the French were doing such a good job, Walther just kept production there.
The guns were made in France, shipped across the German border to the Walther plant, proof fired, stamped "Made In Germany" and sold all over the world.
To be fair, in Europe the country where the gun is proof fired is considered to be the country of manufacture.
All this came out in America in the 1970's when Walther contracted with Interarms of America to produce the PPK/s here.
Suddenly the gun writers informed us that they'd known for years the guns were really made in France, after writing all those articles about the wonderful German craftsmanship of the Walther guns.
In the 1980's, the Walther contract with Manurhin ended, and the French decided to sell the gun under their own name in the US.
This started a magazine ad war in which Walther said that only guns with the Walther mark were the "genuine" guns, and the French saying that since they actually made all the guns since WWII, THEY were the genuine gun.
After a couple of years, they made some kind of deal, and Manurhin stopped importing PPK/s guns into the states.
These European guns, whether marked Walther or Manurhin are fine quality guns with few reported problems of any kind.
The second type is the Interarms guns, actually made in Alabama FOR Interarms.
First guns were blued, then stainless.
They eventually made blued and stainless .380 and .32 PPK/s and PPK models.
Quality was good to very good, with some history of reliability problems later in production.
Some people rant and rave about the Interarms guns, but a lot of us had 100% reliable guns.
I owned a very early blued gun and a mid-80's stainless, and both never had a jam, including with reloads.
In the late 1990's, Interarms founder died, and his daughter shut the company down.
There were apparently at least some PP series guns made in some American production plant for someone, but I don't know these details.
In the late 1990's, Walther and S&W started a relationship, and this finally included production of Walther PP series guns in a new plant in Maine under S&W control.
These S&W/Walther's are slightly different, with an extended tang on the frame to eliminate hammer or slide bite, and these guns require a slightly different grip which won't interchange with the older guns.
To sum up, a European PP series should be good but these were made only in blued with a few plated models.
The Interarms, mostly the later models had a bad rep, but you can only determine this by actually shooting a specific gun.
The S&W guns had some trouble in early production, but they seem to have gotten the problems ironed out.
These guns are all magazine sensitive, and many problems are caused by after-market magazines. Stick with genuine Walther marked mags.
These guns are often sensitive about ammo, so be prepared to experiment to find one your specific gun "likes".
These guns seem to like to be run a little wetter with lube than some other guns.
The trigger pull in double action is stiff and heavy, and this is due to the leverage inherent in the 1929 design.
There is little that can be done about this, and spring kits often cause reliability problems.
Custom work to improve the DA pull is usually a waste of money since the difference is usually too small to be detectable, and again, possibilities of reliability issues.
The best "trigger job" is to simply shoot the gun until you get used to it.
Experienced Walther shooters are often surprised when a new shooter tries one, and complains.
After a while you just don't notice anymore.
The Walther PP series was the "Gold Standard" in small defense autos from the early 1950's up until the mid 1980's.
No other small .380 managed to pack so many features and so much quality into as small a package, and it's still near the top end in .380 quality.