I've been cynical about wearables over the years, but the fitbit I received for Christmas has not only stimulated me to take more walks, the sleep monitoring functionality has made me much more intentional about my setting myself up for good sleeps. And it wasn't at all an issue to disable all the notifications stuff from it so that it's a monitoring device only.

I know I'm still in the honeymoon phase with it, but overall I really have been pleasantly surprised.