Update for snadge:
Had a couple of resynchs in the last week due to power cuts (our area of Essex was flooded badly last Saturday). Uptime was over 400 hours before that. No change in sync speed at all, still 19.4mb and SNR Margin remains at a steady 6dB, sometimes dropping to 3.5dB at the lowest during the evenings. Very low Error Seconds - currently 3 in 36 hours. Nice! Some detailed (as much as this router allows anyway) stats for the last 36 hours:
ADSL up time 1 Days 12:34:31
Upstream line rate (kbit/s) 1020
Downstream line rate (kbit/s) 19420
Line standard ADSL2+
Channel type
Interleaved
Upstream SNR (dB) 8.6
Downstream SNR (dB) 6
Upstream line attenuation (dB) 6.9
Downstream line attenuation (dB) 13
Upstream output power (dBmV) 10.5
Downstream output power (dBmV) 0
Upstream CRC 3
Downstream CRC 0
Upstream FEC 28251
Downstream FEC 0
Regarding fastpath, with TT, we'll still be on a 6dB profile (the fastest they go up to) with the only difference being no error correction at the DSLAM and no DLM, which I would like to have in case the line develops problems, so we can still have a service, albeit limited. I'd imagine, from my understanding that throughput would be the same but with lower latency/ping times, which I don't really need as nobody plays online games etc here.