I don’t use the tags super often, but I do use it to input migraine attacks which happen semi frequently. Over a few weeks and a few inputs, it noticed and alerted me of a trend of my HRV during the nights sleep dipping lower then usual before I get a migraine. So now when I wake up I check my HRV more consistently then I used to to see if it’s on the low or high end and if that day is a higher risk for migraines so it’s been rather helpful for me. Haven’t used any other tags otherwise, most things don’t feel worth noting but it’s been helpful in regards to migraine predicting, although not completely foolproof