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SMC model SMCD3GNV Gateway

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I recently received a letter from Comcast saying that they have increased speeds in our neighborhood and I need to upgrade my modem.  I went online and did the device upgrade and received the SMC Gateway, not a modem.  I am concerned that this gateway does not provide the full range and power of my CISCO plus valet router.  Comments that I have read on the gateway says that it lacks power.  I also provide a hot spot for visitors.  I am reluctant to go through the trouble of installing the gateway and wonder does it really provide better performance and speed?  Any comments or suggestions would be appreciated.