I like shooting the MP5, and even was pleasantly surprised with one of those Zenith clones (in SBR form, even better), but even the clones are more than I want to spend for what they are. I was able to compare a bunch of the common 9mm PCC guns, including some modern stuff and some older stuff like the Uzi and MP5, and found that for suppressed shooting the MP5 was definitely the quietest and most accurate. However, it's still an ~8 lb 9mm. There are some applications where that makes sense, but for my uses, without full auto, my money is better spent elsewhere.
I will say the Zenith I used had some feed issues that were caused by magazines - turned out all the bad magazines were factory HK; the Zenith mags worked flawlessly. I had to bend the mag lips on the HK mags to get them feeding right.
