HI ALISTER,
i think it is worth having as it's a big improvement on the original version
that i previously had.
and the cellular version will even allow you to use it as a stand alone phone
whilst your iphone is left at home.
at the minute you need to be with EE as your phone provider to use this
capability but shortly others will be doing the same including O2.
you can also use siri on the apple watch3 now, and quite a few companies are
now releasing watch versions of their apps including national rail and british
gas hive so you can do much more on the new watch compared to the previous
versions.
pete.