The first time I tried my new Charge 5 I went out in the rain, with rain gear on. By halfway through the walk, the lining of my rain jacket was a bit wet, same as from sweat, and it starting acting like I was pressing the screen. Every time my sleeve touched the watch it would perform some random function, starting / stopping exercise, vibrating etc. My fingers were wet with rain too and I found I could not operate the watch at all. This wasnt a downpour, it was just normal, regular rain. I wasn't swimming or doing anything crazy, just taking a walk, and the watch was completely unusable.
I love the look of the watch, and it seems to have some nice features, but:
a) it is missing some kind of lock so you can stop this wet weather craziness
b) wish it had the side button like the Charge 2,3,4 had - you could always get them to work in wet weather
