The ergos on the Sub 2000 aren't good, but a pleasant shooting experience was never the intended goal of the Sub 2000, it was meant to be a cheap, light, compact PCC that could easily and discreetly be brought places. While I still like mine, I barely shoot it and my interest in it is nowhere near as high as when I got it, but I consider all the other options for a PCC and there are reasons I'm not sold on them.
The Hi Points are lower in price, but high in clunkiness factor to the point the last I handled one I can't understand why people speak so highly of them, yet dump on the pistols. The Ruger more refined, but a heavy piece (typical Ruger) and at $600 a bit of a hard pill to swallow given Ruger's current QC issues. Beretta Cx4 I would consider if they ever made one compatible with Taurus 92 mags, and then there's the AR PCC builds.
All this leads me to believe that there is no one perfect PCC. The Kel Tec, while I don't question its longevity or reliability (some early issues, but those went away after breaking it in) the Sub 2000 was built for working, not for plinking.
That said, the discussions about the SU16 in another topic have me rethinking what the Sub 2000 is compared to that. When I bought mine it was purely for civil unrest situations where if I didn't have access to or ran out of rifle ammo and only had handgun ammo, would I rather have a handgun or a carbine? I decided a light carbine had some potential use and figured you can't beat a Glock mag compatible PCC that weighed a few lbs and folded in half. That philosophy still holds true today.