Wait, a whole week? That's crazy to me. If I buy something new, I should know if it works for me pretty fast. A week of wearing a watch that feels useless is a long time. I'm not going to force myself to use a gadget hoping it gets better later. It either fits into my life now or it doesn't.
A week seems generous to me. Some gadgets just don't click right away. I get what @campbell.cora is saying about learning habits, but if the main feature feels redundant on day one, that's a fair first impression. It takes real effort to find a use for something that doesn't solve a new problem.