the HG will probably still sync higher on same dslam config but the error rate should plummet with a ECI modem on a ECI dslam.
If the HG would take you over the DLM threshold which then means possinble banding/interleaving then ECI could well also mean improved speeds.
Some people who got DLM'd got back on fast path by switching to an ECI modem.
I am on a ECI dslam and using HG from day to day since the higher error rate isnt enough to take me above the DLM threshold and isnt anything noticeable on my connection either, the HG has far superior monitoring to the ECI device which is why I am using it.
BT Infinity 2 Since Dec 2012 - BQM