You can turn off the contacts sync which I did, useless for those with corporate or iCloud sync.
So far I find it useful. When I walk downstairs I get a notification that I'm getting out of range of my watch on my phone. I'll have to try it the other way which is the important case.
The app on the watch has a meter that shows you how close you are to the phone which could be useful. Have to play with it some.
For the privacy aspects, I turned off all the stuff I don't care about: contacts, system check, monthly premium for special notifications, etc. Just the basic 'tell me when I separate the two devices' seems to actually work.
So far I find it useful. When I walk downstairs I get a notification that I'm getting out of range of my watch on my phone. I'll have to try it the other way which is the important case.
The app on the watch has a meter that shows you how close you are to the phone which could be useful. Have to play with it some.
For the privacy aspects, I turned off all the stuff I don't care about: contacts, system check, monthly premium for special notifications, etc. Just the basic 'tell me when I separate the two devices' seems to actually work.