How many people here have actually shot a fairly wide variety of submachineguns?
Out of the available stuff in the US for non-exotic agency civilian types, that'd be Macs, M76, Reisling, Thompson, MP-40, Uzi, MP5. Semi-auto versions including the PS90 and the UMP builds for more modern stuff.
For a personal gun, it's about what I shoot best. The fullsize MP5 I shot first before the K, got me from the start - it was a laser beam that almost wasn't fun to shoot because it was too easy to use. My personal K-PDW is one of those guns that just does what it's supposed to, regardless of marketing or hype or whatever.
It's not perfect. Bolt hold open/safety could use work. It's heavy for what it is (but not as bad as the Uzi or Thompson by a long shot), and I'm not sure that making it lighter wouldn't take something away from the shootability.
And the shootability is what matters in the end for me. I'd sell many, many other things before having to get rid of mine. Even if zombies never come, and I'm forced to defend myself against roving clay pidgeons or cans, I'll be happy with it.
But none of that will ultimately matter, because HK hates me as it makes $60 a magazine from me and god knows how much in spare parts. I know it because that's what these threads devolve into.