ADSL2+ is useful to get SNR to 3dB from 6dB to get extra sync line speed rate. But for FTTC, no need to reduce SNR at all.
id disagree for people on longer lines, like me, id love more speed on fttc for the sake of a bit of stability, id rather have 2 or 3 disconnects a day rather than 10 or more days of perfect slower stability.
1060m from the cab, 3 lengths of poor aluminum , 13mb ! says attainable rate on the unlocked modem is 19mb, Grrrrrrrrrrrrrrrrrrr