One of the only benefits of this miny NAS (Network Storage Area) is its independence from a computer. If your computer dies, you can still access the data from other computers as long as its on the network storage device. Also, if you need to, you can just unplug it and take it to any place that has an ethernet connections, say... a friends house. What better way to share MP3's??? Or other files?
As far as using them, its easy... Plug it in and your done. You can access it by using the IP address assigned to the device. Once your initial connection, you can map a network drive on other computers to access the drive when needed.