There's an extensive discussion group about the K-3 on groups.yahoo.com.
It's an excellent camera, for what it is. It's a spring-wound non-sync camera, so you won't be shooting dialogue with it, and it only runs for about 25 seconds before the spring gives out, so you won't be making your breakthrough independent film with it (unless you're these guys:
www.donutholethemovie.com).
But it is stable, takes a great picture, and is extremely affordable. If you get a good one, they're great to have around. If you get a bad one, just dump it and try again!