Heart rate data is stuck in their ecosystem and it doesn't have any open ended app capabilities, but for $60 on GearBest it's definitely interesting
Unless you live in a country where every user can demand the release of the data about them. In Germany (and AFAIK all of the EU) for example, that is the case.
Besides that, I consider unfriendly design like that a big reason not to buy a product. Why buy a product you know you need to send legal letters to the developer just for properly using it?
https://github.com/Freeyourgadget/Gadgetbridge/wiki/Amazfit-...
1. https://www.amazon.com/dp/B01KM4NCP8/ref=cm_sw_r_cp_apa_mB-I...
We'll see how it goes, but I bought a Pebble 2 HR a few months ago and love it. This is my third Pebble.
It most likely won't happen, but if it does, its an easy fix.