That package is a good deal for your speed package and netgear modems are amazing. I just recently upgraded mine to the CM700 https://www.amazon.com/NETGEAR-DOCSIS-XFINITY-Comcast-Charter/dp/B07976SNVB/ref=sr_1_2_sspa?s=electronics&ie=UTF8&qid=1531035105&sr=1-2-spons&keywords=netgear%2Bmodem&th=1 since I pay for 150mbps my "download speeds are actually 180mbps" i needed something able to handle the bandwidth. But either way you can't go wrong. It will pay for itself in less than a year and you will get faster speeds than using comcast equipment. In fact you will probably hit 80 down with that modem. Comcast throttles there own equipment so you only get exactly what you pay for but your own modem will squeeze everything it can from them. I bet more people would get there own modems if they knew this.

I have the same speed tier with a Netgear CM700 - never had a problem with it:

https://www.amazon.com/NETGEAR-Cable-Modem-CM700-Compatible/dp/B07976SNVB