I'm extremely happy with my Sub-2000. It gets shot every time I go shooting 'cause it's such a fun little plinker and ammo's so cheap. Folded, it fits in my range bag, so there simply isn't any reason not to tote it along. I have several thousand rounds through it, almost entirely Winchester White Box, with only a single hiccup to date. It's held up well, and doesn't show any appreciable wear.
My wife loves it because it's light and has no real recoil. It's short enough for indoor work, and the ten dollar kel-tec sling works well as an assault sling. I have no problem hitting paper plates at a hundred yards with it. Extra mags cost me ten bucks each, and I haven't had the problems entropy describes. I got six of the 17 round Eagle mags, and had to chamfer the mag catch holes just a tiny bit on two of them to get a positive lock. They've all functioned fine.
Getting out with the Sub feels exactly like being 12 years old with your first .22 again. The little things are just a blast to shoot. Pretty much every time I go out, I end up letting others try it, and they all love it. I know it's on several shooting buddies 'to buy' list.
You can find them on gunbroker for $250. There really isn't any reason not to get one.