The app stopped workong today after just one month. I uninstalled it, reinstalled it -- and still nothing. This seems like a gimmick more than a useful household appliance. So, our Roomba is now essentially a paperweight. Guess we will go old school and use the vacuum cleaner. Oh well, $275 down the drain. Addendum: Roomba is now sits in the garage in storage. It takes more time to clean up the mess this thing makes and fix the damage it causes. Save your $. Invest in a quality vacuum cleaner.