I don't use mine for CCW - it's more of a car gun, but it can be carried under a heavy jacket - the weight just makes me limp
. For a carry pistol, it's a S&W 637 for me. As far as the VP70z goes, the simplicity of design and the 18+1 round capacity were some of the major reasons I chose it. Like I've said elsewhere, I considered the trigger pull and the absence of a hammer to be sort of safety features - aside from intentionally taking off the safety and squeezing the trigger, I can't imagine one being accidentally discharged. And I think the sight is interesting, too, the only problem is it's backwards from every other pistol I shoot (you're looking for the dark spot instead of the shiny blade) and it absolutely disappears against a black target. Takes some time to adjust to it.
The positives for it are safety, ease of maintenance (4 moving parts), accuracy (once you get used to the sights), mag capacity (there aren't too many pistols out there with a true double stack magazine), comfort (I have small hands - the VP70 was the only high-cap autoloader that I found that was comfortable to me), and reliability. I've fired lots of ammo through mine, including some cheap crap that wouldn't work in anybody else's pistols (hey, it was free) - the only problems I've had were when I got hold of some 9mm that had been loaded with rifle powder.
Thanks for the idea about the trigger job! I'll check with H&K. Because of the design, the only "trigger job" I can envision would be a weaker spring on the firing pin. I've always been afraid that the reliability would suffer, though, and that's one thing I won't tolerate.