Its not really implemented yet. The various router vendors are still working on fully implementing the chipset and there is trickle of patches still coming from

Its not really implemented yet. The various router vendors are still working on fully implementing the chipset and there is trickle of patches still coming from Filogic development on the chipset making there way into the vendor firmwares and OpenWRT. There is also the issue few client devices implement at this point as well and certainly nothing that is mobile in nature on the sales pitch of "it costs power".