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Good performer, easy setup, mainly trouble-free. Does not run as hot as lower-speed modem it replaced and so also doesn't need reset very often. Only caveat is that you can only attain the 1000MB speed with certain internet providers, like xfinity or cox, I believe. To get more than 500MB speed with RCN, the modem must be DOCSIS 3.1 (this is 3.0). I was not aware of this when purchased, but 500MB is more than fast enough for the service package I upgraded to, so no problem there really, unless I ever want to upgrade again (which seems unlikely since the kids have moved out now).
Verified purchase: Yes | Condition: Pre-owned
Replaced my Xfinity modem to save the $14 month rental, fee. When directly plugged into the modem my laptop gets the full bandwidth but once I connect my router and plug into one of the lan ports the speed is noticeably slower. I think Xfinity throttles the speed when you replace their modem for your own, as this has happened with previous devices. This is no fault of the modem, other than that it works fine for my needs. I could have gone with a Docsis 3.1 device but with the internet plan I have I saw no real benefit. I will see how this holds up over time but I do not foresee any issues, it is working well so far
Verified purchase: Yes | Condition: Pre-owned
My only criticism of this modem is that it has only one ethernet port. Otherwise, it is working really well for me. Works perfectly with my Google Mesh network system, and allows me to fully utilize all the features of my Ring security system (my previous modem/router did not allow video from my Ring system).
Verified purchase: Yes | Condition: Pre-owned
The MB7621 is perfect for my situation. I get exactly the speeds I pay for, without overpaying for a “faster” more expensive new gigabit modem from the likes of Arris or Netgear which would have cost 4x more. Best of all, I am avoiding the $14 monthly equipment fee I was paying Xfinity.
Verified purchase: Yes | Condition: Pre-owned
Easy to connect. Came alive as soon as Comcast registered it at their end. The original speed has definitely improved but not to the speed Comcast is charging me for. Will update after taking this up with Comcast. This is one of the modems in their approved list.
Verified purchase: Yes | Condition: New
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