Main reason why I got that router, is the failover over LTE feature.
While it does work, for some reason, it will often just use all my mobile data instead of using the WAN. Take an example of today:
My WAN went down at 4.xxAM, I did receive the event SMS
My WAN went back up 5 minutes after, I did receive the event SMS.
Just now I totally killed my LTE cap by watching youtube (my WAN was online)
I did attach my Failover configuration.