There are a couple of significant downsides that temper my
enthusiasm for the new Gear. First and foremost is the speed and
intuitiveness of the user interface — or rather, the lack
thereof. There’s a tangible lag to anything you do with the Gear,
while the swipe gestures are hard to figure out and do different
things depending on where you are in the menus. […]
Also important will be the Galaxy Gear’s battery life. It does use
the Bluetooth 4.0 Low Energy standard to communicate, but at
315mAh its battery is decidedly small. Samsung promises “about a
day” of endurance from the Gear, but by the end of our briefing
with the company, the cameras on most of its demo units were
refusing to turn on due to the watches running low on power.
About the best you could expect from Samsung without having anything to copy from Apple: overpriced, ugly, laggy UI, terrible battery life, dubious utility.