I have Google WiFi, the predecessor. I believe that the Nest version is faster. I've been a bit disappointed with the system now that I've moved up my internet speed. The mesh part is nice (not having to switch bands or extenders), but I now have 1 gig speed and I'm not getting close to that. Coming through the google router, I just got 561/833. Super fast, but not 1 gig. For wifi, I just got 430/380 on my ipad (not even sure an ipad can go faster than that) while in the same room as the router puck. In the back of the house, I just got 137/231. That's pretty good, but there are other times where it drops to as low as 25mbps in the same spot even if we're not using a ton of data in the house. I'm not sure why. That being said, our streaming has been fine since 1 gig is overkill.
I consider myself a somewhat sophisticated as an amateur with tech, but it's really hard to learn about network stuff. I have CAT5 cable running through my house, but it's not plugged into anything in the basement. I'm assuming I can somehow connect them and have network points to really cover the house, but there's no how to guide.