said by Obliteration:but I am arguing its poorly build because it doesn't perform as it should and very often it doesn't reach those speeds.
What's poorly built? Definitely not the 4200, they are one of Motorolas best modems. Go look in other ISPs forums and see that they don't have any problem maintaining speeds as long as the network behind the modem is functioning properly. OOL users use this modem to hit 10 and 15Mbps without problems.