Upgrades
If I purchase this to go with my current phone a Galaxy III & later this year I upgrade to the S5 will it connect to the new device?
Yes, you can disconnect the watch from your S3 and connect it to your S5 when you get a new phone. You install the Gear Fit Manager on either phone, which allows you to perform all that maintenance. You may lose some of the workout history that's saved on your old S3, but that's a risk no matter how you go about the upgrade. (Unless S Health is uploading your information to Samsung as well)