I work for an agency of 110 sworn officers in a city of about 73,000 people. On patrol, we are required to carry a 9mm. Off-duty and BUGs are pretty much anything goes. By and large, the vast majority of our Officers carry Glocks on Patrol. When I came on in 2010, Glocks were mandatory. A new Chief and new Firearms Coordinator brought more latitude in the Policy. Now, out of the 110 sworn Officers, there are a few M&Ps, a Sig P320, a Springfield XDM, a Sig P226, and four HK VP9s in circulation.
I carried a G17 for the first 5 years (even had an OIS with it), but switched to the VP9 because the grip and trigger were amazing and translated to unparalleled accuracy. I consider myself a "good" shooter; the VP9 makes me a "great" shooter. There is nothing I've changed about my fundamentals, but I notice marked improvement in accuracy with the VP9 over my Glocks. The best way I can describe it is like using "The Force".
Now, unfortunately, I am having some thoughts of going back to Glock. Here's why: 1) No Armorer support. We have a handful of Glock armorers on hand at my agency and zero HK armorers. Unlike Glock, who actually offers classes EVERYWHERE, HK seems to only offer them in Virginia if I wanted to go learn for myself. Sure, you can watch YouTube and learn the ropes, but that would not fly from a liability standpoint in the LE world. 2) Magazines. I don't care that I lost 2 rounds per mag when switching from the G17 to the VP9, but why the hell an HK mag costs twice as much as a Glock mag is beyond me. Also, I don't see any companies making training mags (Magpul, ETS) for HK so you are only.left with the ungodly priced factory mags. 3) Parts and accessories are more expensive with HK. 4) Grip. When I establish a proper grip on the VP9, my thumb rides the slide stop lever and my gun never locks open out of battery on the last round fired. I have tried to game it by changing my thumb position, but that only turns into a crappier grip and diminshed accuracy. Also, I would more than likely revert back to the grip I've been using (ala Glock) for years, under stress.
I thought I could manage these issues, but maybe not. Other than that, it's a great and reliable gun.