Greg trains athletes and he's not a fan of the heart rate monitor of the Apple Watch. Leo says that nothing is going to beat a breast strap that monitors heart rate. But in time, maybe. The Watch is close accuracy wise, but it's not going to replace a Garmin for more serious, higher performance activity. His best bet is patience at this point. It's early days still. Give it time and it'll not only be more accurate, but it will have more features. Polar straps are supported by the Apple watch via Health Kit, however.
Eric is having trouble syncing his wife's Fitbit with her phone. Leo says that the Fitbit will use Bluetooth to sync to the phone with the Fitbit app. Eric will have to pair it. Then she can use her cellular data to upload her Fitbit data to her account. The Fitbit doesn't need Wi-Fi to work -- it just needs Bluetooth to connect to the phone.
Tom likes that the M7 processor lets him track his steps. Leo says that's a great feature and all modern smartphones can now do it. These phones are as good and as bad as a Fitbit. There's limitations just like anything.
Is there anything decent for health tracking? Leo says that the dirty secret of fitness bands is that they're just pedometers. That's all. There's a lot of hype with them. But they do encourage people to take that extra step.