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I have this too, for the same use. The GPS didnt lock once which was disconcerting but on the 4 other runs so far it has worked fine. It takes a while to lock doesnt it? I almost went for the TomTom Spark Music - seems a very solid platform for running, with music and not too crazy a price. The Moto 360 Sport looks good too. Another option is the Sony B trainer (earphones with GPS and a music player in), looks expensive but great.
Will have a look at those over the weekend and see what they are like.