In reply to goldmember:
I have a TomTom Runner 2, and I'm ambivalent about it. I'm not convinced the measured HR is all that accurate (though that's to be expected with any optical HRM, and easily fixed with a chest strap), and I didn't find the display of metrics/training zones while running
that intuitive to begin with. That said, it works just fine, syncs to your phone via the TomTom app, and from the TomTom app to other software. It syncs well with Runkeeper, I have no idea about Strava as I don't use it.