I'm a former marathoner but now just run max 10kms now. I would probably require metrics more for fitness and not so much about personal bests. The Garmin Forerunner's (235 & 620) has great reviews. But they feel cheaply made of plastic and cost just as much as an AW. With the new GPS feature in AW2, it has certainly sparked my interest. That said, I've always liked the SS model and think it may be too heavy for running. I suppose I could get the lighter aluminum model although it's still kind of bulky and worry it'll flop around ( I have small wrists). Runners, do you swear by hour Garmins? Maybe best to get a lower cost Forerunner 235 and pick up a discounted SS Original AW from BestBuy.