For all people being upgraded to Max please read the following regarding the capping issue after upgrade.
The issue appears to be where a line is connected to a router and so on-line when the regrade actually happens, BT do not recognise the new line sync as being from a Max line (it's too quick). Later re-syncs at the same rate do not prompt BT to take any action either. This means the normal 75 minutes for a new or regraded line does not happen. The line should have the rate correctly set after 3 days. The reason some lines appear to work is that they are either slow to reconnect, not on-line during the regrade, or sync at a different rate later. Ironically this does mean that really good lines that always sync at a full 8128M are unlikely to have the speed change applied promptly.
The upshot of which is that if you are going to be upgraded turn your router off overnight.
[Addendum] - Another feature of the upgrade to Max is that your SNR will drop, possibly to single figures. This is normal and to be expected as a result of the upgrade.
