Got a Moto 360 because it was the only watch that didn't make you look like a tit at the time I bought it. Battery is about a day of decent use. Not use the HRM, not sure if I have GPS, it's best purpose is being able to change what you're listening to without taking your phone out of your pocket, worth it for that alone.
I bought that strap from Primria for it, it actually looks decent, which is a rarity for smart watches.
Yeah, it's very affordable too, definitely a good intro to see if you're going to get use out of it - I reckon at least 50% of smart watches that have been bought to date are under beds, in drawers, stowed away unused.