Most hardware: GPS, HR, PulseOx works fine most of the time, although HR sometimes shows high values and exaggerated. The watch looks good and the battery lasts for days on a single charge. The software (sigh) ranges from just "good" to insanely awful, depending on when new features are added to the watch and whether the forces at work at Garmin allow them to be turned off or not. If you just want a watch to track your fitness, avoid it at all costs. I am someone who runs because I love to run and this watch has robbed me of my favorite pastime. This watch will beep, buzz and interrupt you during your workout to alert you to slow down, speed up, your heart rate is too low or too high, or your "physical condition" is deteriorating. He will also try to discourage you from starting classes if he thinks you haven't had enough rest. It will even emit multiple beeps throughout the day to let you know if you've had enough or not enough rest. Most of it cannot be switched off, at least in the current software version (15.20). Nothing is more representative of this than the Suggested Workouts feature. Based on a complete lack of knowledge about what you're training, the watch will throw you into seemingly random workouts. For example, you could train to run a personal best marathon. Suggested workouts might ask you to run 10 meters and then walk 10 minutes. Repeat this twice and then avoid all exercise for two weeks. While some of these features can be turned off (e.g. performance condition pop-ups), others cannot (suggested workouts can only be turned off after a break or without using the watch). for at least a week, and Recovery Advisor cannot be turned off at all). Update: Since the 15.10 firmware update, I've been getting "Recovery Advisor" throughout the day to let me know how I'm recovering. I hate it, mostly because it usually interrupts me when I'm trying to focus on something more important. Also, I follow a training plan that the watch doesn't know about, so these training guides aren't helping me one iota. I even put in a new 10K-PR, doing almost the complete opposite of what the watch was asking me to do. I gave them a low rating for the complete inability to disable persistent interrupts. In the event that Garmin updates the software to allow these algorithms to be disabled, I will revise my review as the low score is almost entirely due to software issues.
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