When I first set up this router I recall getting 200MBs (bits/s) but now it is slower than the 4g modem/router which normally clocks in at 15MBs. This has been consistent over several days/reboots/fiddling with TTL values (using Google Fi Data only SIM)
I’ve used Fi data sims in so many devices. Currently have one operating in an old as heck T-Mobile sync-up drive. The sync-up drive is so old that I needed micro to nano sim card adapter. The key is to activate them in a phone first. You can ignore the Fi app nagging you to activate the voice (I think) stuff.