Ignore the speedtesters and use the TBBmeter facility to download a large file.
Mine was installed today and speedtest results are highly variable.
TBB gives the worst results (anywhere from around 20Mbps up to 34Mbps - the most recent is 28Mbps).
Speedtest.net gives 37.4Mbps down / 8Mbps up.
BT Speedtester not working for me, because BT still
haven't allocated the correct number for my line and I've been without a useable phone all day
Usenet downloads have been consistently maxing out my connection. Newsbin reports a download speed of 40.2Mbps (although this seems to include overheads, so the actual speed is closer to the 37.4Mbps reported by Speedtest.net.
No idea what I'm synced at. The installing engineer didn't plug any test equipment into the line (or the Openreach modem) - don't think he knew how (I even had to keep him here whilst I tested the Home Hub, using a laptop, to see if I even had an internet connection - all the LEDs were on, and he was happy to leave it at that, without any testing whatsoever).
He had a hand-held test instrument but said he didn't know how to use it to find out the cable length to the cabinet
vDSL2 FTTC Infinity with BT
DL Sync not a clue, but DL speed is around 37Mbps
UL Sync again; not a clue