With a spare magazine, it's easy to carry 17 rounds of .380. I have a Beretta 84FS Cheetah that is one of my favorite pistols, but the Walther gets lots more carry time because it is lighter and more compact. The single-stack magazine allows for a slimmer grip that is easier to conceal.
In reality, loading up tons of ammo is great if you're a soldier in a combat zone or a police officer but kind of a waste of time otherwise. In the event a civilian needed even one magazine to end a lethal force confrontation, they were either in a situation that boded no good for their side (too many adversaries) or they were in a place where they could leave. Fire a few shots to keep their heads down and get the heck out of Dodge.
Incidents like the Miami FBI shootout, where 145 shots were fired by the FBI agents, Miami Police and the two criminals, and the North Hollywood bank robbery, with an estimated 2,000 rounds exchanged by dozens of participants, are exceedingly rare. Most of the other high-shot-count episodes are fired on unarmed victims by mass murderers before they are either captured, killed or commit suicide. The overwhelming majority of self-defense situations where a firearm is used, the shot count wouldn't empty a Smith & Wesson J-frame. Of course, I am as guilty as anyone, on occasion; when cooler weather comes, my choice of carry piece is a full-size 9mm with either 17 or 21 rounds of ammo. On the other hand, in summer months, I often just stick the PK380 or a S&W M637 in my shorts and feel perfectly well-armed.
I have also owned other Walther pocket pistols including the PPK, PPK/S and PP. Yes, they are very nice guns, as is the SIG P232. However, the list price for a PPK or PPK/S is $626.00. For the SIG, it's $720.00. For the PK380, the list price is $393.00. With the PPK, you get 6+1, with the PPK/S, you get 7+1; with the PK380, you get 8+1. In a pistol that, compared to the PPK/S, is just 0.4" inch longer, 0.9 inch taller, 0.27 inches wider and weighs 3 ounces less. I like the way the Walther feels, I like how easy it is to shoot and rack the slide. About the only wish I have is for an M1911-style safety like the one on my Beretta Cheetah.
To answer the OP's question, I happily recommend the PK380: it's one of the best handgun values out there.