Almost perfect
Great little router (Beryl) , good and user-friendly controls, and great performance.
The only small issue I have is that in case of 4g/5g tethering the charging power is really low - it's enough to ensure no battery drain during use, but your phone battery is already low you have to choose what's more important to quick-charge it or to tether first (or use a wireless charger if the phone supports it). I don't expect it to deliver high power for fast charge but ut seems it's below the regular slow charge, as my phone give me the warning of weak charger when I'm tethering with the Beryl.