I have a 9mm carbine and a .45 pistol - the newer polymer framed one, I bought both NIB. The carbine came first and is great fun. I haven't put a lot of rounds through it, but from what shooting I have done with it its fun, accurate, and I haven't had any problems.
The .45 is good mechanically, certainly not a combat-ready kind of handgun, but a long way from being junk either. The catch I've run into and heard from others is that Hi-Point mags SUCK! :barf:
I had to modify mine with a pair of pliers to get to feed and I understand that its a common problem. If you get one of their handguns I'd say be prepared to do some magazine tweaking to get it to work properly.