apple uses surfing to promote the watch. i think apple corporate wouldn't use show a watch surfing for a workout it wasn't ok.
But hey what does apple know? clearly their resellers must know more.
Go for it? i did. worked great. washed it with fresh water and no issues. there is this mode called water locked where the watch is locked and only shows the kite app when I'm on the water and when I'm finished i turn the crown and it unlocks and makes this sound that clears water from the speaker. it really spits out water when it makes the sound! the guys who made the sessions kite app got this swizzle figured out for sure! it. spits.out.the.water.after.the.session. hahaha, its fling hysterical to see.
i bought my watch for $260 and I use it for all sorts of things now its super rad. Same price as one of those wooo things and not only gives more data from what i can tell i can actually use it so its better money spent than just a stupid blue brick that just tells me that i jump higher than my buds. best part i can check the wind with the watch and never miss it!