To me, these watches are a waste since you still have to carry your phone and they slave to the phone somewhat. I also hate iTunes.
That being said...
From a sales standpoint, I believe Apple will be the first successful company with regard to these devices. Apple marketing has created such a need in their customers for the newest of their devices as well as turned their brand into a sort of smart status symbol. It can't help but sell.
Kudos to Apple marketing! They are amazing. Their methodology should be studied in business schools the world over.