I don't really know for sure, because I haven't seen all of these threads discussing particular issues with knoppix-installer. But I suspect that alot of them arise because people chose the Knoppix-style install. The Debian-style install is what you want, and is the one that is similar to knx-hdinstall. I'd suggest trying knoppix-installer first, because it will allow you to name your user, rather than having to go in and change it manually later on (which isn't too hard, but why do it if you don't have to?).