The ZyWALL 10 is pretty much the same product as the Prestige 312 that I reviewed about a year ago, with the following differences:
Schedulable Content Filtering has been added
Redesigned user interface
Slightly smaller physical package
The new user interface drops the two Windows-based "PNC" applications that were used as the primary administration tools on the P312, replacing them with browser-based admin screens. These screens (see the examples below) give access to many, but not all of the 10's features, so you'll still need to use the Telnet interface to access the others. Since firmware upgrading can be done via FTP or TFTP, the result of all these changes is that the ZyWALL 10 is no longer limited to Windows-only administration for users who aren't happy with a Telnet only user interface.
The router default configuration has the WAN set to be a DHCP client and the LAN DHCP server enabled, so many users will just be able to plug and go. It also comes set to 192.168.1.1 and a default password, which you should change as soon as possible, since it's commonly known!
You can manually set the WAN port information or have it act as a DHCP client and obtain everything automatically. It can handle "host name" authentication (like @Home uses), the RoadRunner TAS Authentication methods, and allow you to set the WAN interface MAC address equal to that of a NIC connected to the LAN side. This last method will help AT&T Broadband users whose service is tied to a specific NIC avoid having to call in their new MAC address.
On the LAN side, you can set the starting IP and range of addresses that the DHCP server will hand out (up to a max of 32 addresses), or disable it and assign your IP info manually. Note that the DHCP server will also hand out Domain information if you've entered it, a handy feature for @Home users.
The PPPoE setup allows you to enter your account login information and set an idle timeout. The User name can be up to 45 characters long.