Personnal
Advantages: After a bad start (needed to do a flash firmware reset ), the watch now behaves very well. If everything is turned off and you keep only non wi fi functions (watch, pedometer, and heart rate which, to me, is very realistic as I have heart problems) , you are good for almost 3 days of power. With wi fi on, the processor is very fast, and the keyboard is large enough on the square screen. Also, the 3 functions buttons are very handy and useful shortcuts. The whole screen is very responsive. The unit is lightweight and, although it looks fragile as it's not made of metal, to me, it is solid and I like the fact that it is thin. In fact, I already own a No 1 D 5, ( for which I wrote a review a few weeks ago), and like it very much also but I always end up wearing the No 1 D 6.
Limitations: I was afraid when I was stuck with the watch that would not reset. But, a firmware update solved the problem. Thank god !