This review is for the second Biostrap I've purchased. The first was stolen and the friendly staff at Biostrap helped me replace it. In both cases, I opted for the less expensive version. As a cyclist, I didn't really see the benefit of the shoe pod, since I calculate my physical exertion via a power meter and heart rate monitor. So, the purpose of the Biostrap was to quantify my sleep quality and recover, primarily with resting heart rate and to some degree heart rate variability. The recover score and sleep score are great summaries of this data. The charging pad that comes with the first Biostrap was plastic and cheap-looking, while the second was slick (aluminum-like and glass). Interestingly though, it didn't work. So, I reverted to using the cheap version, which is very finicky in terms of position and activity the recharging function. On several occasions I came back to a dead battery... make sure the light turns blue before you walk away. Summary, the charging needs to be fixed. The first Biostrap never had a problem syncing to the app on my phone... very reliable. The second Biostrap has been a nightmare and constantly loses connection to the phone and is a struggle to reconnect. I have to say... If I had this same experience with the first Biostrap, I would not have bothered replacing it. I would have opted for the Whoop despite the subscription model. In short, the customer service was very helpful... top marks. I like that there isn't a subscription model and the sleep analysis works well as long as I can keep it synced with the app and get the recharging to work. Then again, maybe I just got a lemon.