The modem hardware was installed and registered by Comcast in less than an hour. Great hardware and (unusually) great support from Comcast. Update: After four months, the data transfer rate has halved. The speed increased from 525 Mbit/s to 278 Mbit/s. I replaced it and a Netgear R6700v3 router with a Comcast xfinity gateway. My data rate is 575 Mbit/s again.
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