Ok, I've been fighting with this thing for one month aproximately, this is what I found. My phone is Note 3 SM-900 KitKat and my watch is the Gear Fit (Awesome watch for the price, i did a review in my page
(www.paramebola.com)
1. There's two main S Health apps from Samsung, the version that comes with s4 and note 3 and all of the "old equipment" (Like my note 3 would've been 10 years old, come on Samsung!!!) this is version 2.? (Whatever your phone have), and there another version that comes with the Galaxy S5 which is 3.? (They have like 10 versions now since launch, faulty I guess.
2. I have downloaded S Health and Health Service from galaxy S5 (XDA developers) and tried every single combination, I can tell you all "once" the phone synced the pedometer and then it all died, I discovered the phone looses all configuration on restart and it eats battery anywau.
3. You also loose all of the my fitness app syncing if you do this, by all means this messed up the Sleep function, which sometimes is helpful for me since I have trouble sleeping because i spend lots of time reading blogs. (hahahaha).
4. If you want to install the sleep function for the S Health 3.? version, then you have to download from samsung apps, but it won't recognize my note 3 as a compatible device for it, so once again, screwed.
5. Samsung won't give out any information, they just have a little note in the gear fit page that says something about compatibility in the future (I hope is not 2016).
If you want to try,
aptoide has all of these apps available for you to download.
So, I will wait. If I know of any new version that works before Samsung decides that not only Galaxy s5 users are important (Note 4 is supposed to be released in September) then I'll let you know.
Samsung...... do you mind reading this?, do your users have to get into so much trouble to get things done?, why do you think people root their phones?......