Just got my AC68U, with the "Reducing USB 3.0" option set to "Enabled" (default) the read speed from an NFTS formatted USB3.0 Seagate drive is around 3 MB/s, with the option set to "Disabled" the speed varies between 2 and 13 MB/s. Can't say anything else but that I'm extremely disappointed, my old AC56U was faster.