Excellent! I have a ComCast in southern New Mexico and have had constant internet problems on my Motorola 7420 and the old SurfBoard it replaced. I traced my problem to the splitter that powers my internet connection and the rest of the house. Replaced it with the Extreme I had laying around and again had a nice clean signal. I never had problems with TV - only with internet signal. I needed to replace a service/junction box on the side of the house (broken hinges) and the tech replaced my splitters with their current choice (CommScope). This resulted in poor signal quality with the same constant upstream power spikes, a steady stream of corrected/uncorrected words, stuttering/hanging/erasing, a heavily populated event log, etc. The same issues that ComCast couldn't handle me were. I ordered them, replaced the primary splitter on the Drop with Extreme and again - a clean, strong, balanced signal on my modem!
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