The staff is responsive. The devices seem to work fine. My only concern is that the mobile device that connects to get help if there's an accident, has to be charged DAILY and it takes 3 hours....3 hours in which the device must be on the charger and I cannot leave the house safely. I called to see if there is a way to know how much charge remains in the battery, as I can with my phone, but there isn't! They say it requires charging every 24 to 48 hours, but since I can't tell how much charge remains at any given point, I feel constrained to charge it fully every day.