Meh. As much as I am into the Apple ecosystem and generally love the quality of their products, I think this is a pass. Even if I were an avid runner, I don't think I want this on my body soaking up sweat and subjecting to scratches and dings. This product is finely made enough (and costly enough) to be an attention seeking device when you're out and about, but I don't like to attract that type of attention.
My recent reads on this are: very limited battery life and limited functionality. For me to want to wear a watch every day, it has to bring something to the table that makes it indispensable. I don't see that yet.