Definitely much better than SleepWatch. I’ve tried many apps and sleep analyzing smart devices like S+, jawbone up (like Fitbit), apps that use either the microphone or the motion sensor in the phone (placed on your mattress by your head), to track, analyze, and improve sleep quality and consistency. None of them come anywhere close to as good as this app combined with wearing your Apple Watch to bed and using the “lights out” button on the Watch app to tell it you are now turning out the light and attempting to begin sleeping. It can still work without the watch using the phone motion sensor, but I can’t speak to how well that works. Even better, if you have already been wearing your watch to bed regularly, as soon as you install the app you can review the past 7 days of sleep from data the watch already routinely collected while sleeping. It seems accuracy improves going forward though, possibly because this app causes the watch to collect data more frequently throughout the night. I recommend also you fine tune how still or restless (move a lot while asleep) a sleeper you are, such that if you remember getting up or waking up in the middle of the night, that these waking events are detected at the times you recall them occurring. Other waking events may be detected by the app which you do not remember, but that is ok and expected - part of the purpose of using this app regularly is to track and identify awakenings throughout the night which you do not remember.