Woeful experience, device had trouble connecting from the get go, would take dozens of attempts to successfully pair in the app. Then each night it would lose the connection, and when I finally managed to reconnect the next day it would have no data from that night. Tried on two different iPhones, same problem. Support was abysmal, it would take multiple days and often multiple messages to get a reply, and when they agreed that the device was faulty and offered a replacement they also informed me that the 30 day window where a refund was available would not be extended from when I received the new device. This basically forced my hand to get a refund instead of trying a replacement. For a company that markets their products as top of the line, and charges prices that reflect that I'd expect a lot more, 0/5 stars.