Didn't think it did enough for my life to justify wearing it all the time. I've heard similar things from lots of other people.
My mother in law is a fitness/workout competitor. She has a Polar Watch. She likes it. It's more for the hardcore fitness crowd though, so I don't know how your wife would like that.
I ordered an Apple Watch. We'll see what it's like. Most of the reviews have been very positive about the fitness features.