This is the newer v3.2 AX5400 version (the old one was AX3000).
Don't forget to use your favourite cash rebate app and pay with Amazon gift cards for more potential savings.
I replaced my Deco M5s with these a few months ago albeit at a higher price =( and it's improved connectivity to my back fence whereas my M5s only reached to 3/4 of my house, so now there are no dead spots even upstairs.
Set up was very simple via the app instructions and I was up and running within 20 minutes. I wanted something easy to set up and it's kept the family and guests happy during tv streaming times during the school holidays. Also worked well with Teams video meetings while family were streaming movies.
The Deco app appears quite simple to use for a tech novice. There are some advance features but i'm not technical enough to know how to leverage them. Overall i'm happy with this purchase and at $395 it's a couple of hundred dollars cheaper than other retailers currently.
It looks like you can use M5s (and other Decos) together with these X60s however, I personally found that some older devices kept getting confused and switching between routers frequently, and not choosing the one that seemed most obviously closer with direct line of site. After removing all M5s I didn't have any issues anymore and everything has been running seamlessly and fast. No more buffering pauses on my Fire TV Stick at the other end of the house.
Highly recommend these routers and points for excellent coverage, ease of use and parental controls.