Buffalo's installation routine discovers the appliance and offers to map shares for you.
The NAS Navigator also auto-discovers appliances and offers more mapping facilities and access to the management interface.
The TeraStation offers plenty of RAID options and supports up to two separate arrays in the same appliance.
Plenty of access controls allow you to easily decide who can use the appliance.
The appliance can manage its own scheduled backup tasks and copy data to another TeraStation.