i got my perfect condition open box series 1 last Saturday. Coming from a first gen I am loving the speed increase. I don't swim much but I can't help but wonder if I'm missing out on the waterproof and most of all the extra screen brightness. I am a Speech Pathologist so I do most of my work indoors and when I am outside I haven't had issues seeing my screen but can't help but wonder about that brightness difference. Is it worth the $130 increase in price? (I bought an open box series 1). Thank you in advance.