Stuck an old IDE drive in following the fairly clear guide given in the instruction manual and powered up connected to the USB port. Did a couple of read/write tests using the Linux program bonnie++ and all came back well with a good USB transfer speed. Powered down, hooked the network cable up and allowed it to get an IP address from my DHCP server, then in to the web interface. The interface is sparse to say the least, but looks quite nice and is functional. Set a static IP, reboot, format the drive and set up some samba shares.
I cannot get Linux to authenticate on the SMB/CIFS shares, but Windows had no problems whatsoever. The unit is running the latest available firmware, and I'm running SuSE 11.4 with Windows XP running in VirtualBox with a bridged NIC. I have another NAS on the network and have no issues authenticating to that, or to an actual Windows share, which may point to a firmware issue on the NAS itself.
Network performance is OK, but bear in mind it is a 10/100 NIC. This isn't an issue on a 100M network, but if you have, or are used to anything faster, it will seem slow. It is faster than 85M Powerline or 54M wireless though!
Drawbacks are the use of the FAT32 filesystem, so DVD images in excess of 4GB are a no-no. I'm looking for a hacking community who have managed to get the disc formatted in ext2/3 to overcome the filesize limitations.
Overall then, for the Windows user, it really is quite good. For the Linux user, curates egg. It'd be nice to use CIFS in place of FTP, but it isn't a major issue. A cheap, and fairly good looking way of getting a NAS and using up an old IDE drive. For the home user who wants to backup, perfect. For a small office?, maybe better off looking elsewhere. Not a purchase I regret.
EDIT: If you buy one of these and wish to use CIFS under Linux, it is possible. I found it quite by accident. From the command line, smbclient \\\\192.168.1.6\sharename logs in, then Voila!, I could connect normally from Linux. Quite why, I have no idea. You'll have to substitute your allocated IP and sharename of course. I suspect, but can't prove that it is a clear text/encrypted password issue.