Horrible!! Created an account, but now it won't even log in. Press login, and it just thinks for a few seconds and goes right back to the login button. Device will connect via Bluetooth, but data can't be viewed offline. Useless!!! Update: I now have Dream Station 2. Surprise, surprise, app still useless. It won't pair by following the included instructions. I paired it manually, got "success" message on DS2, but app won't recognize that it's connected. USELESS!