been using this for a few weeks now and the phone is terrible at picking up a GPS signal when I want to go out for a run. Also there seems to be a problem causing the screen to stay on. I can see that it tries to go to sleep but as soon as it goes black it comes back to life again. Horrendous on the battery life - there's no way I could use it to track anything more than a 10K run. But I do like the software, it seems to do exactly what it's meant to do as and when I get a GPS lock.