Cox also lets you just buy a cable modem and install it yourself, without a visit from a technician. Comcast and other companies require you to have a tech visit and charge you $100 just to plug in a modem.
Nope, not my experience. The last time I upgraded my cable modem (18 months ago?), I called Comcast tech support, plugged it in myself and was up and running in 15 to twenty minutes tops. I have never had them come out to just plug in a cable modem.