Hi Cox,
I've very excited to hear Gigablast is coming to my area! Yesterday I decided to upgrade to Gigablast after logging into my account and seeing that it was an available option. I purchased a Docsis 3.1 modem as suggested by Cox, and installed it. Once installed, I called to give them the MAC ID and then they "enabled" Gigablast. I ran a speedtest and received almost 800Mbps down. About an hour later, I noticed my WiFi speeds were crawling; so I ran a wireless speedtest and those results came back at 2.5Mbps down! I ran speedtest after speedtest and spent almost 2 hours on the phone AND had a technician come out this morning to test the line. After hours of troubleshooting with Cox reps and by myself, I decided to downgrade back to Ultimate and voila! Reverting back to Ultimate fixed everything. My WiFi was back to normal and I was getting the speeds I had before upgrading to Gigablast.
I live in a pretty new apartment complex in Tustin so I'm not 100% positive the infrastructure is there for Gigablast, but the system did let me upgrade and I (briefly) saw near-Gigablast speeds. If I use the Cox Gigablast availability checker, it shows my address is not available for Gigablast. Maybe it's a bug? I honestly don't know, but I would love to have gigabit speeds. I also find it strange that my entire network came to a crawl after "upgrading". Even hardwired speedtests were coming back at 52/53 Mbps. Every rep and the on-site tech showed the signal coming through at 1100Mbps, but I never got those speeds. I even tried running a network cable directly from modem to computer and was never able to pull an IP address. I kept getting a 169.254.
Sorry for the novel, and I look forward to an answer.
John