An old thread , but with a vast array of smart watches of late , i thought it might be worth reviving, and perhaps by now a few more dudes and dudets may have had a chance to give us the good oil on whatever they have been using.
i was having a bit of a look at some watch reviews the other day with some of the popular ones, and what i learned was really the majority of them are really an accessorie for your mobile, and no doubt they are all very useful and clever in what they do.....but.....check this out !
http://www.getneptune.com/#experiment
when the screen loads ...scroll down.
This thing (neptune pine) is the full monty of smart watches, you can put your sim in it and it is a full function smart phone, via button/s it unclips from the band and becomes a phone, pretty cool device i reckon even if a bit ungainly on the wrist.