yes. I am a mobile beta tester. and I got an invitation by email. like I said in the post. the ping value is depend on which server you link to. if I changed to a smaller server like openface or ebox, the ping will go up as much as 35 instead of 3 to 7.
so far the speed is stable (2 days). at installation I have experienced a bit of turbulence (the speed is no stable and it goes down to 30's and come back to 90's Mbps for a few minutes.) but after finishing set up, it runs stable now (even with the cellular signal "black-out" yesterday. not sure it if it is related).
the wi-fi of the modem is not as good as my old TP-Link AC1900. so I connect the TP-Link router with a Ethernet cable and use it as "wi-fi extender"