I bought the strap to relieve my wrist from the watch at night. I love it. It fits perfectly, tracks the sleep data and syncs to my garmin connect in the morning.

Completely unreliable as to whether it’s going to record sleep, connect to my app to transfer information, or if an alarm is going to function, if the alarm is goi g to function the vibration even set on high is so slight I can’t depend on it to wake me up. I’ve honestly been putting my old Fitbit on as an alarm instead.

So far I am very happy with the sleep monitor. It is more accurate than the wrist watch and is comfortable to wear. I dont notice it at night. I dont have any real sleep issues but it is great to track my fitness metrics.

After 2 weeks, I find it forces me to reevaluate my evening habits and get more consistent sleep.

I made the decision, long before fitness watches with heart rate tracking came about, to get tattoos on my forearms. And so I struggle with HR monitoring -- wearing a chest monitor when I run. Sleeping in a watch is impossible. Inevitably, the tattoos get in the way. The new sleep monitor, which I wear on my untattooed upper arm, solves this for me. Super comfortable. Really works well -- it definitely seems much more accurate than the very erratic wrist measurements.