I bought the full Biostrap package with the armband, wristband, and ankle tracker. I wanted to use it to get a better reading of the quality of my night's sleep and see the intensity of my workouts. It did that with some caveats. Pros: 1. The wristband is nice, it does a good job tracking activity and sleep. It seems pretty accurate. 2. The armband does a great job tracking your heart rate in real time. If you use it when running with the app, you can get real time feedback to increase or decrease your intensity. Cons: 1. The wristband regularly disconnects with the app and requires you to cycle Bluetooth on and off to reconnect it. 2. The app drains your battery a lot unless you limit background usage in your phone's settings like 20%+ a day. However if you limit background usage so you don't have to charge your phone during the day, you have to manually open the app and wait for it to sync your sleep/activity data. Then you have to wait even more for it to process your sleep data. It can be cumbersome. 3. The biometrics function is essentially useless. It only collects "good data" about 1/3 of the time even when I'm wearing the wristband and arm band properly and sitting still. 4. The foot tracker pod is pretty much useless too. If you want to use it to track your steps, you have to remember to turn off step tracking with the ankle pod anytime you're not wearing it. Why, the app won't use your wristband if you're not wearing the ankle pod. Also, it looks kinda like a prison tracker when you wear it and I got some interesting comments about it when just wearing it around. 5. Additional functionality like "improved sleep tracking" and "meditation tracking" are only available if you want to pay an additional monthly charge. Wasn't the tracker enough as is? 6. The fitness tracker takes a daytime reading every 10 minutes however when I look at the data points it seems to only collect 5-15 valid points a day even though I wear the tracker pretty snug. Not really a big concern for me. 7. Overall the app is pretty slow, battery intensive, and kinda buggy. It feels like what you would get if you only wanted to pay for the $30 tracker. It's in dire need of an update to reduce battery consumption and improve connectivity. 8. None of the data is stored locally (as far as I can tell) which means every time you change screens, the app needs to pull data from their servers. Usually that's not an issue, but it does make for a pretty slow experience with this app. Overall, functional, but my no means glamorous. It feels like a startup that had really good marketing but failed to follow through on the back end. A few simple improvements to the software, and this would be a 5× better option than FitBit. As it stands right now, it's breakeven and maybe even a bit worse.