The Linksys Tri-Band is made of up 3 radios, 1 using the 2.5 band, 1 using the lower half of the 5 band, then 1 using the upper half of the 5 band. How 1 + 1/2 + 1/2 = 3 is "marketing". What you really get is two radio with half the band funtionality disabled. Not something I would ever consider buying.

The Xirrus Wi-Fi equipment has this capability built in. With the directional radio's the location has accuracy has always been this good. I don't see why MIT copying features already available to the public in existing technology is news. It is fine that some collegian wrote software to do the same thing as an existing product. But as someone else pointed out, all enterprise level Wi-Fi products have a version of this already.