My two cents: I don't know any person who is into serious running (I'm into triathlon, so add cycling and swimming) who would spend $350 on the Apple Watch and additionally you are required to have your iPhone with you to use the GPS. A sports watch without GPS, IMHO is a no go at $350. For (I won't comment on the lack of info on battery life and water resistance). *Edit: changed from water resistant to waterproof.
Do they have watches, sub 250, that can be used for swimming OR running? Even just the swimming would be great, cause the price point and being forced to carry an iPhone around kind of defeated the purpose of buying the Apple Watch for me.
Run, swim, AND bike. Excellent.