A lot of folks can't help themselves but to compare the Kel-tec Sub2k against more conventional PCC's, which really isn't apt. The Sub2k was designed to be a pack or truck carbine, carried often and used in a pinch, however, the folding design, and overall VERY compact form makes obvious concessions when evaluated as a sustained fighting carbine. Against dedicated PCC's like AR-15 conversions, CX4, CTG29, PC9/PC4, MP5, etc, evaluated as a fighting carbine, the Sub2k has clear and extreme limitations. Evaluated as a camp rifle, pack rifle, or truck carbine, it excels above these other models. Against the
I've owned 4 of the Gen 1's, but only one of the Gen 2's. I've never noted any difficulty in getting them to feed reliably, no moreso than any other PCC, or even Pistol I have owned, for that matter (which list in 3 digits), and in fact, they were less finicky for ammo tolerance than many pistols I've owned.
One thing I find interesting is this evolution of our industry to start "complaining" about the folding design, and its inherent preclusion of compatibility with mounted optics. The Sub2k's have been around a LONG time, but I've only started hearing complaints from folks in the last few years about the difficulty in mounting optics. In my opinion, it speaks more to the refusal of new shooters to adopt iron sights than it does to any shortfall of the Sub2k. I've killed dozens of coyotes at my feed yards over the years with Sub2k's, never having a red dot sight. So no complaint from me about a folding pack/truck carbine which only has iron sights. It's more compact than the Win 94 Trapper which I hauled around off and on over the years as my feedlot carbine, and a lot faster to load and unload --> and of course, my Trapper only ever had iron sights too.
I've kept mine as a home defense carbine off and on. For its fast handling, it's well suited for the application, even though a lot of folks might cite the CX4, AR15's, or MP5 clones as better. Realistic reasons for that preference escape me.
To end my own rambling here, I'll leave you with this: If you're wanting a PCC to play tactical operator, inside or outside of competition, then there are better suited designs out there. If you want a lightweight and compact pack/camp/truck carbine with realistic expectations for real world applications, then it's a fantastic design. The Kel-Tec Sub2000's are reliable, durable, and very affordable.