<I haven't used it for this purpose yet -- has anybody?>

No, and we shouldn't encourage them. I sincerely hope and expect that it will be about as popular as Esperanto. (With apologies to any members of the World Esperanto Association who happen to be on this board.) Seriously, its just a stupid marketing person's idea that the right people at Swatch must have mistakenly taken seriously. Its enough to make you join S11.