Arris (S33-RB) - Cable Modem - DOCSIS 3.1 Multi-Gigabit Cable Modem for Comcast Xfinity, Cox, Spectrum & More 1 & 2.5 Gbps Ports 2.5 Gbps Max Internet Speeds 4 OFDM Channels 1 Year Warranty - Renewed

Works perfectly with Comcast/Xfinity. Super easy to setup, good quality at a good price. Provides a much higher speed than older units.

Great modem. Did self install on Xfinity and cabled its 2.5GB port to my router. Easy set up, high-speed and super reliable.

For a point of reference, I'm a network engineer. This is easy to set up, if it works for your specific application. The problem with it is, there is no way to easily configure things such as the internal DHCP server or certain security features you'd have access to with an older modem. If your firewall on your network will not receive a DHCP address correctly from this device, you have little options for resolving the issue. I wiresharked the connection and my firewall was failing to negotiate an IP lease from the modem. With no way to access any meaningful interface other than the web interface on the modem (which is useless since it only shows information and does not allow any configurations to be edited) or using the completely worthless Arris android app, which is just informational and does nothing to configure the device, you're screwed. I've had the device randomly fail several times. Each time the DHCP server in the device failed to hand out an IP address to my firewall. One time, the cable company pushed out a firmware upgrade which broke it. The firmware upgrades have also removed my passwords and reset them to the default. Bring back user editable configurations and my rating would go up. But this canned one size fits all unconfigurable crap is a pain in the butt.

I have nothing to complaint about the modem itself. It is a factory refurbished model and looks like new. Installation on Xfinity was smooth, just had to remove my old Motorola plug the coaxial and Ethernet cable to the S33, plug it to the wall outlet, open the Xfinity app and add the new modem. It worked on the first try. I have the 1.2gb/s plan so I’m supposed to get 1.2gb/s download and 120mb/s upload. As I’m limited to my router’s 1gb/s port I’m not expecting to get 1.2gb/s download but the 120mb/s download would be very welcome. As you guys can see in my second picture I’m getting about 977mb/s download and 948mb/s upload internally using a gigabit LAN connection. The third picture shows a internet test and there is where the problem using the S33 with Xfinity is, can’t get 120mb/s upload because Comcast blocks this modem from using mid-split with their network because they say it has not been certified so if you want that fast upload speed you will have two options, renting their modem or buying a Hitron CODA. I’m giving the product 5 stars because it’s pretty good and the issue with Xfinity is not the product’s fault so if you don’t rely on high upload speeds using Xfinity go for it, it’s certified by Xfinity for up to 2.33gb/s download but if you need high upload speeds look elsewhere.

While my ISP contract is for 300 mbps I have always gotten up to 375 even 380 on occasion while using an Arris 6190 DOCSIS 3.0 for many years now. This hasn't changed with the DOCIS 3.1 and I wasn't really expecting it to since that would be an expectation too far. But when testing my speeds at different times throughout the day, with the 3.1 I get more consistent max to near max speeds. Setting this modem up would have been a breeze if Spectrum's set up page actually worked when upgrading a modem vs installing a first time new one. I was hoping with fingers crossed that I could get 'er done in 15 mins max and not have to call for assistance. Not to be. Trying to use their chat was a waste of time as well. Whoever was on the other end was lost from the get go and abandoned me in no time flat. So after finally telling their robo recorded menu I wanted a human (customer support) which wasn't a choice on their menu, I broke through to someone who had a clue. So the 15 mins I was hoping for turned into the better part of an hour and a half for a simple setup. One thing: the BRIGHT blue light that so many reviewers seem to be complaining about here, isn't that BRIGHT on my modem. In fact it isn't BRIGHT at all. It is just a blue smiley face light at the very bottom of this very tiny modem, and even looking at it in a completely darkened room it isn't BRIGHT. So I'm left to just Laugh Out Loud. ;-) Lastly, this modem to the touch feels a tad warmer than the 3.0 but their is ample ventilation at it's top, where it should be, so that should not be a problem. Also, I have as yet been unable to access the modem's settings page. 192.168.100.1. I get nothing. Not really a big deal since my experience with that page for the 3.0 was that it gave the status of the modem. That's about it. No real settings to speak of. If it's status ever becomes 'not working' I'm sure I'll know that without needing to go the modem's web page.

Works great for half the price!

should have gotten it sooner, ive been running this modem for months now and has kept up with the demand, 4k TVs, about 5 Gaming Consoles and various smartphones and Tablets.

Easy to install, nice product!