>>20478162The strap on a stock W217 is likely just as "durable" as a stock F-91W. It will likely snap in three or four years (I hear UV light accelerates this break down). The W217 has springbars, so a strap change will simple as fast. Make sure you go 18mm width and 1mm-1.25mm thickness.
I bet it will be an awesome watch. I totally agree about the backlight. I mainly wear an F-91W and the lack of back light does become an issue at night when I'm not around streetlights (city dweller).