This works well to control my a/c from my iPhone. I inherited this in a home I purchased. Once I called support to have them remove the old owner, I was able to register the thermostat.
It works just as I was informed and hoped for. Though I have owned it for just a couple of weeks, nevertheless, it does give me peace of mind to be able to check the thermostat remotely. The weather conditions in Florida (especially in the summer) certainly merit the little extra expense.
The naming portion of your thermostat location is very difficult to set on the mobile device if setting up for more than one. I had to do an invite from the first device adding a member of my family in order for them to be able to help control the device temperature.