I really like it! I sell it at work and some customers are really intrigued by it. It's camera is pretty average but it really excels in every other aspect!
Thinking about trying out Project Fi. I'd probably get this phone.
Really would like Samsung Pay because of the magnetic terminal compatibility thing, but my bank doesn't support it. My bank doesn't support Apple or Android Pay either, but they said they'd support Apple Pay by the end of the year I think.
My other options are a Samsung Galaxy with Samsung Pay compatibility or an iPhone 6S/S+. IMO iOS is an amazing mobile OS.