You guys are ridiculous. This is a piece of wearable technology that will literally be attached to your body for 18 hours per day. The idea that you can get a sense of how well it will fit into your life by fiddling with it in the store for 15 minutes while an Apple employee hovers nearby and awkwardly tries to talk fashion to you is laughable.
If you are interested enough in the Apple Watch to want to try it out for two weeks, I guarantee that Apple wants you to buy one and return it if you don't like it. I guarantee you they will still want you to buy one even if your initial expectation is that you won't like it. Because if you change your mind, they've made a sale they wouldn't have made otherwise.
This isn't like a chainsaw or something, that you could buy for a weekend project and then return. That would be clearly unethical.
And I suppose, if you couldn't really afford to purchase the Watch, but simply wanted to wear one for two weeks for free and return it before your CC bill comes, that's unethical too.
But in this case, I just don't think buying a product that you want to try out but don't expect to like enough to keep is unethical.
I'd bet that if you walk into an Apple Store, picked any product on the shelf and asked a salesman "I'm interested in this but I don't think I'll get enough use out of it to warrant the cost, can I buy it to try it out and return it if I don't like it?" they will happily sell it to you every time.
If you are interested enough in the product to want to turn over your money for it at all, you have met any reasonable moral or ethical obligation you might have. If the product is not compelling enough for you to want to own it for longer than the return period, that's not your problem and it isn't a moral problem to return it at that point.
No one is saying returning something is unethical. The OP didn't say I'm not sold on the apple watch so I'm planning on buying one and if I don't end up liking it I'll use the return policy. No one would complain at that.
The OP specifically said they just like tech and want to play with it but not actually enough to pay for and keep it. They later tried to back out of it by pretending they might keep it if they like it enough but that wasn't in the OP at all.