You gadget-lovers probably know a few things about this kind of device. 
It runs Android, which has a Linux kernel, so it isn't even off-topic, 
maybe.  I just read this review and was disappointed:

http://gizmodo.com/5926728/sony-smartwatch-review-maybe-the-worst-thing-sony-has-ever-made

I was disappointed because I was thinking of buying one.  But if it's 
really *terrible*, I'm not going to buy it.

The idea is very cool.  I feel that the Gizmodo critic is expecting it to 
do things that it doesn't promise to do, but it also sounds like it 
doesn't do what one would expect.

For me, if the watch could just be a watch when out of contact with the 
Bluetooth phone, and hold contact when the phone is within 5 feet, that 
would be enough.

I'm not sure how well the battery holds up.  If it can't do a full 24 
hours without recharging, I wouldn't be very happy with it.

I think there will be a smart watch in my future, though.  It makes sense. 
Even if only to see who's calling without pulling the phone out of my 
pocket -- that would be awesome.

Mike