Ragnor: Not much difference between 1.2Mbit and 924 Kbit, I doubt you would even notice the difference in real world usage. If you convert to KB/s it's ~150 KB/s vs 115 KB/s.
The explanation for why is basically that Telecom and Orcon use different vendors for their ADSL equipment and Orcon run a more aggressive noise margin by default.
Telecom run a safer noise margin that means sync speeds are slightly lower but more stable.
I agree with you there. I should be happy about my 18mb download and 150kb isnt much. Yeah I remember someone from orcon saying their noise margins are quite good. :| Cheers for your help ragnor!