The most important thing for the monitor is to notify you when your child is restless. This is so you can soothe them, but more importantly, so that you're secure in the knowledge that they're not suffocating or in danger. Notifications have been sent irregularly to my and my partner's device for the past 2 weeks. Before that, they were fine. There is an update that needs to fix this, else I will not change my 1 star rating.
The unit also shuts down every few hours and takes a while to reset.
Other than these, it's functional, with nice features such as temperature and humidity gauges.
The app is very delayed, you hear the baby cry before the alerts kick in. It's a good gadget to have for monitoring but not the best I suppose. If you have other Arlo items then it makes it easy to access them all in one place (app). Make sure you have good internet connectivity, otherwise you will be disappointed.