It works and is deployed in dozens of places, including British Telecom and AT&T. T reports typical speeds of 750 megabits, up and down combined. The highest speeds go less than 150 meters, which is fine for fiber to the basement. In 2018, 212 MHz chips will double that speed. Plans include 10M homes passed by BT and a million at nbn Australia.
AT&T and Deutsche Telekom are first doing G.fast from the basement for highest speeds. "Wireless to the rooftop" (WTTR) is attractive to others. BT has pioneered long reach to homes, getting speeds of 160 to 330 megabits 300 meters. nbn is running fiber to "distribution points" close to homes, expecting high performance. The small DSLAMs can go on poles or in pits. More http://fastnet.news/index.php/105-reality-check/602-gfast-reality-check