I have the 15Mbps Earthlink through TWC. Before getting this modem, I had a TWC DOCSIS 2 modem. While it obviously did not increase my peak speads since those are capped by TWC, switching from the DOCSIS 2 to the DOCSIS 3 modem greatly improved the stability and reliability of my internet connection. Since D2 only uses one channel, if there is any sort of interference on that channel it will adversely affect your internet connection. Since the D3 modem uses multiple channels, interference on one channel can be compensated for by the other channels. Before switching, my download speeds would fluctuate from 5 to 16 Mbps when I would test it. Now, I pretty much get a solid 16.3 Mbps no matter what. My new modem also seems to handle any network problems much more gracefully than my old TWC modem did. I remember back when I had the TWC D2, I would have to reboot it every few weeks, but I've had the D3 modem for over 6 months and have not had to reboot it once. I highly recommend you upgrade to a DOCSIS 3 modem regardless of what your internet speed cap is.