I had owned a Keltec P32 and P11 that had never worked fully reliably but had owned a Sub2k for G17 mags for a couple of years and fired about 1,000 to 2,000 rounds through it.

The gun has a heavy bolt that catches the recoil and allows very fast follow-up shots. I never had a single problem with reliabilty but did not like the inline stock with the awkwardly low sights and the red plastic front sight post that disappeared in low light.

While the Sub2k does not display a particularly nice finish and appears cheaply made but the function is not compromised and Keltec has a pretty good warranty in case something should fail.