Oh god I installed Nest fire alarm products throughout my home. Such a PAIN. Last 8 months at most before new batteries. Wireless updates kick it off the network all the effin time. Wish I could get my money back - now I am committed to this garbage product for at least 5 more years (if they last).
Worst - incredibly little value generated from nest.
They still work when they aren't connected to wifi but they send me monthly reports from Nest that they aren't connected and my app sends me notification.
Now that I think about it - probably nicer not to have it connected to wifi at all.
Worst - incredibly little value generated from nest.