Everything worked pretty well, but as of the Health Mate 5 update, it has stopped syncing sleep data to Apple Health - it only displays it as "in bed", not "sleeping" as it used to. And I'm not the only one, over on Reddit there are other people having the exact same problem happening after the exact same update.
Support doesn't reply to emails.
I bought my Pulse HR specifically to monitor sleep since doing that with an Apple Watch is really bothersome because of battery life. But now that that doesn't work the Pulse HR is next to useless.