Incredible value for a peace of mind feature I always wanted: automatic failover and switch back between a main ISP and 4G (cellular) services!
Configuration is a bit confusing if this isn’t your first/main Deco, so here’s a tip: first connect it as an ADDITIONAL Deco, “promote” it to primary within the app, and then truly connect it as such primary. This way the app migrates all your settings and avoids reconfiguration.