CAMERA!!
Unfortunately, after much internal debate (I even ordered then canceled), I have decided not to get the watch. I am as early adopter as you get. Had palm pre day#1, Evo3d day#1, Galaxy S4/S5 day #1, even the developer kit for oculus rift. But, I have to draw the line, having no camera is a huge step back for a standalone device. As a physician/surgeon, taking pictures in the operating room of pathology or scanning documents with a quick snap shot is one of my most useful tools. And if I need to bring phone for that function, the watch is simply not stand-alone. I can justify many drawbacks, like battery life, size, speed, advanced phone-like functions because it is a watch, not a phone. But... cannot go without camera. Really bummed, was looking forward to getting this smartwatch.
Hopefully be back someday. Samsung definitely has the most experience with smart watches. Looking at trends, it's only a matter of time before someone hits the nail on the head with regard to the tech/battery/functions.