So there are a few threads around here (a few pages back) that discussed the new heart rate features for watchOS 4 and S0 watch. After restoring my watch as new with my 8Plus, I have now received the heart rate recovery feature on my watch. In addition to that, Health is now reporting V02 levels while working out. I also have the option to turn on elevated heart rate options. Now with that being said S0 doesn't get everything, resting heart rate and walking average do not populate, only workout related show up. But I figured I would just let everyone know that S0 isn't completely out of luck.