I have the GT5 PLUS, and have been using it for about a month. So far, I am very pleased with it. I also have the Fitbit Sense 2, I bought the GT5 Plus to replace the Sense 2, because of having to pay a monthly Fitbit charge, with this there are no fees. I've been comparing my blood pressure readings via watch to a arm blood pressure monitor. I followed a video for correct placement of watch to be placed on wrist and followed the directions on how to have my arm and proper seating, before doing BP reading. They have been pretty close to one another. Sometimes the watch measures it tad higher, other times a tad lower, but extremely close to one another. At times closer than the Sense 2 did. It's been dead on, for my blood oxygen level, in comparison to my finger blood oxygen reader. I tested this watch, while wearing my Fitbit sense 2 on the other wrist and was pleased to see that they were almost exactly the same, in measuring for my steps counted, stress readings, as well as heart rate, and while doing the ECG on both. Not sure about how accurate the Lipids, Uric, or Glucose are, since I have nothing to compare that to. I do like the Electrical Pulse that it has, not sure it's doing anything, I use it when I'm having pain, the longer and harder it's set the more it takes my mind off my pain. I also like the reminders for, drinking, moving and taking pills. When checking my stress levels if on high side or when feeling anxious, I like using the breathing training in the workout list to help me to relax. I've been pleased with the battery life on this watch. Though I don't use it to make and receive calls or text, I did try it out and it is a nice feature to have, it seemed to work fine, I just prefer not to talk via speaker even on my phone, as where everyone can hear whole conversation. The watch doesn't always stay connected to my Bluetooth, though that doesn't seem to matter, because it's still communicating with it. Possibly through a direct app sync or maybe a Wi-Fi sync, which can sometimes bypass the need for a constant Bluetooth connection.