You can connect the Seagate Wireless Plus to the internet and then share that internet connection with up to seven devices.
You can also share content stored on it with up to eight devices with a range of up to about 40m (line of sight). Users can stream pretty much everything from it.
I managed to get 3 different HD movies to 3 devices simultaneously without any hiccups thank to its native 802.11n connectivity. The drive was within a 2m (6ft) range from the three devices and the content was accessed using Seagate's own free media app (available for iOS, Android, Kindle Fire and Windows 8/RT – but not Windows Phone 8).
You can also access the content of the hard drive – which is not password-protected by default - via the device's web browser. The app can also be used to back up your files without using a PC.
Wireless Plus can sync with your Dropbox or Google Drive automatically when connected, acting as a massive buffer. Seagate has judiciously added AirPlay and DLNA compatibility to the product which allows you to stream the content of the drive straight to an external display.
Setting it up was pretty straightforward and intuitive, the setup guide being rarely used. You can also use a SAMBA-compatible app to access the files in the hard drive.