[JeremyNT]

I assumed that they used only large arms to make the device appear smaller. On a typically sized woman's arm, I suspect this thing would look quite hefty.

The fact that it seems to be relatively large may unavoidably limit its appeal to smaller individuals of either gender.

[nick_ok]

Do you think that a smaller version might make the interface unusable? I wonder if they are keeping it that large because they cant get the insides smaller or because it would not be easy to use.

[JeremyNT]

I suspect it's the smallest they can do while still meeting the technical requirements.

There is definitely a size below which usage would suffer too much for many people, but such a device doesn't need a very large UI, since most of its utility is in displaying small bits of information quickly, and extensive data input is performed better on a phone anyway.