If you had to explain the Watch in one sentence what would you say?

[swingerofbirch]

I used to work Apple Sales over the phone and the hardest product to sell was MobileMe. The reason, in my opinion, is that you couldn't say in one sentence what MobileMe was. And I actually liked MobileMe a lot, in spite of its bad reputation.

I think the Watch suffers this problem, as well, which is made worse by not yet knowing all of its specifications.

I don't think it could be describe as a high-end time-piece with added benefits because high-end time-pieces are not mass marketable.

I guess to me, if I had to write one sentence about it, I'd say: It's a wrist-worn ancillary computer with heart-rate monitor.

I guess once people use it, they'll find what they like it for. But why will they buy it to begin with? What's the must-have feature?