I’ve been using this for 3 months now and have found the most useful feature is the ability to track temperatures from all my remote sensors (as well as the main sensor). I used it to track how all the different rooms in my house react to outside temperatures, opening/closing windows and drapes, reactions to heating and cooling, etc.. VERY useful.
I’m currently tracking the temperature in my attic space and comparing with temperature changes outdoors as well as living space, which has led me to convince myself to install a whole house fan that pulls living space air into the attic (and therefore pushing attic air out the roof venting). I can hardly wait to install it and experience the ability to bring my living space (and attic) temperature down to outside temperatures immediately (within minutes, If I sized and vented correctly).