This is what I always do:
If it's within 14 days of your return policy, never call the support line. The 1-800-MY-APPLE store line is MUCH better as they have way more power to do things such as:
- Express replacement or exchange (you send in first, and the moment they track your shipment is moving they will process new order)
- Express replacement with courtesy gesture (free accessories of your choice)
- Return the product and get your money back if nothing works out
By calling Apple Store line, you ensure that the product is not refurbished or repair as they can only give you a brand new unit, effectively providing you with another 14 day return policy with a new warranty date.
Don't ever let Apple control you until it's past 14 days. Do inspect your watch carefully and make an informed decision. Even if there's a slightest problem, go through the regular line and I assure you your experience will be far better.
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For my experience, when I called AppleCare+, they offered to repair my dead pixel watch within 14 day of purchase. When asked to get a brand new replacement, they were unable to because of their limited option set by their department. After they transfer me to the general 1-800-MY-APPLE, everything became VIP.
Think about it, they know you can still return it, so of course they will do whatever it takes to earn your sale. Whereas for support, most people who call are already certain they will keep the product so they won't give as much crap for satisfying you.
dL