Bests & Worsts Reviews from Amazon

As it appears Amazon is grouping reviews of similar products, I'll note first that I'm reviewing the Netgear Nighthawk AC1900 WiFi Cable Modem with two lines of telephone support. I paid Amazon $279.99. Apparently there are other "AC1900" router models out there, and this is not one of them. I bought this to replace the WiFi cable modem for which I was paying Comcast $10 per month in rental charges. Now it looks like it'll be 28 months before I'll see any return on investment. That'll be fine, assuming my new modem continues to work for the next 2+ years. Setup was easy, and once I'd established my own SSID(s) and password, I called Comcast. The nice Comcast/Xfinity lady who spoke almost-good English got internet and voice telephone working pretty easily -- she had to send multiple signals to the modem but it eventually responded and has been working fine ever since. One surprise for me is that I now have TWO WiFi connections in my house -- one 2.4 GHz signal like I had with my Comcast-provided modem, and a new 5.0 GHz signal. It has turned out that some of my WiFi devices (printer, Oppo BluRay) require the old 2.4GHz signal, and others (iPhone, Apple TV, and even an older Android Nexus tablet running Nougat) like the faster 5.0 GHz signal. While I've been using my new cable modem only about a week, I have no complaints so far. Relatively easy installation, lower monthly Comcast bill. I'm satisfied.