OK; fourth day in and all looking good so far (but ONLY BECAUSE I've come from a 4.5Mbps connection).
I've had a maximum sync (and a 38717kbps profile) since activation.
At off-peak times Usenet (best way to max out your connection) has achieved maximum download speed whenever I've checked.
At peak times (odd occasions during the evenings and now - at 10:30am on a Saturday), maximum throughput has dropped off sharply.
Currently (again; this is at 10:30am on a Saturday) I'me getting around 30 to 33 Mbps from Usenet (so around 10 to 20% down from the maximum speed).
The BT speedtester reflects this peak-time loss of speed and is currently producing results around 22000kbps from a line with a profile of 38717kbps.
So great for me (as I migrated from a 4.5Mbps BE connection), but pretty poor for anyone who's already on a 20+Mbps ADSL2+ connection, as peak times will see little improvement over their current speeds.
It does show that already (in the very early stages of roll-out, and with very few people using FTTC on our exchange), the BT network is showing signs of congestion.
Quite how BT's network is going to cope (as more and more people switch to Infinity) is beyond me - unless they invest significantly in their back-bone networks, we're going to be seeing some very large speed drops over the coming months.
Relatively happy, but to the 'BT is great and BE's network is obviously congested' crowd (he knows who he is), I will say "so is BT's network".
At least my BE connection stayed at maximum speed 24/7 (which is more than I can say for Infinity).
If I'd have moved from a 24Mbps BE connection, I'd be thinking "I've wasted time, money and effort".
Because I've moved from a 4.5Mbps BE connection, Infinity is good for me.
Like I've said all along; Infinity would have to be seriously congested or throttled to be worse than a 4.5Mbps ADSL connection.
It's not worse yet, but give it time
Ade
vDSL2 FTTC Infinity with BT
DL Sync 40Mbps
UL Sync 10Mbps