I was just looking at an Arris TM822G/CT (Comcast) replacement this morning to eliminate the rental from Comcast I have now. Definitely interested in this topic.
With Comcast they do have a list of officially "supported" retail devices. Are you Comcast? Even if not you still may want to look into your companies device support policies. Sometimes this doesn't matter but it can eliminate some headaches when you have idiot, first level techs on the phone that have been instructed to do whatever they can to get you back on the company rental device.
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