BTW, the Toshiba product is called the 'Canvio Wireless Adapter'.
http://www.toshiba.com/us/accessories/Storage/Canvio-Wireless-Adapter/HDWW100XKWF1
For a few bucks below $50 at most places, it allows network connectivity to up to 8 devices in a compact travel friendly package. I personally think it is a great deal, as you can use it with any external drive you want to, AND is compact.
The Buffalo router costs about $60 at most places, and is much larger, but comes is a full out 600 Mbps + 4 gigabit ethernet router.
http://www.buffalotech.com/products/wireless/dual-band-routers/airstation-extreme-n600-router