I have the Apple Watch, and while I did not use my FSA to pay for it, I definitely love it!! And while the dexcom does actually communicate with the phone and then the phone communicates to the watch, you can still be a little ways away from your phone for it to work. 20 feet is probably about correct for that too. The only downside is due to the communication process mentioned above, sometimes the watch can be a little behind the phone in terms of readings. I have never had this be enough of an issue though to be a problem. And it is so convenient to just look at my wrist and see what my BG is and how I am trending.