My speed has improved greatly as well. Last night i received 228 - 290 down and 30 up on my 300/30 plan. I continue to log and have not cancelled my tech appointment for Saturday. At the very least I will print my logs and give them to the tech. As long as they can maintain these speeds I will be satisfied.
I have been a Cox customer for 20 years and upgraded to the 300/30 plan 2 years ago. I have always gotten 325-330 down until recently. Of course no expectation for Cox to provide more than advertised, but it was nice.
I read the FCC 8th and 9th broadband reports and Cox has always performed well. Hopefully they will get their infrastructure issues resolved and continue to provide the level of service that has kept my business all these years. But I will continue to log and document, just in case.
As far as misinformation I am not the only person that was advised they needed a new modem only to purchase one and it made no difference. I will keep my shiny new DOCSIS 3.1 modem anyway.