I had aGarmin that died within 8 months. it was terribly inaccurate during exercises, which is kind of its main job. Thankfully, this fitness tracker by Fitness is 100x better and highly recommended.
The exercise tracking is superb. My Garmin would have extremely irregular heart tracking. I'd be in a full cardio workout and it would register my heart rate at 80bpm. This tracker has no issues - the heart rate tracker works well, doesn't have wild drops, and steadily and accurately records my heart rate with no issues. I've used the walk activity tracker to track a 3 hour hike, and it recorded my route, heart rate, and calories burned.
I've read other reviews mentioning that the battery life doesn't live up to the specs, but I haven't seen this as the case. On my 3 hour hike using GPS, my battery only drained 15%. If you make sure that your Pulse Ox meter is off, you should get several days worth of battery. It also charges quickly, so if you take it off and charge it when you shower, you should have no issues.
Overall, I highly recommend this tracker. It's very accurate, has a good battery life, lots of features, and it is visually appealing.