Pros: Print server, hackable - get into Linux shell, 3 USB ports, web server, ftp server, mySQL, Python, DropBox integration, auto-sync with another NSA, JBOD (two volume) or JBOD (combined volume), RAID 0 & 1.
Cons: RAID 0 and 1 are slower than JBOD (1 drive). I ran many benchmarks and unbelievably the RAID-1 was considerably slower than JBOD with 1 drive. It's likely the RAID is implemented in software, and the CPU can't handle it.
Summary: Completely new to NAS setup and was dreading setting this one up. Checked all the reviews (unfortunately no one seemed to mention printers with this model) then bit the bullet and bought the NSA320 from Amazon. Inserting the hard drive (well I just bought one 2Tb drive to start with) was a breeze. Not being a techie I opted to just set it up as a jbod rather than Raid. Plugged in the mains and network cable and fired up the computer. From there on in it was quite simple.