Loved it at first. Fantastic motivational tool; couldn't wait to upload my stats each time. However, I got a little bit despondent after realising that it is not very accurate. You can calibrate it but as my running changed the more inaccurate it became.
On my first 10k race it registered 11.9 km! It may be that I am doing something wrong.
I now prefer my nike triax watch / heart rate monitor and use a mapping tool for distance and record my runs / stats on FETCH.
In summary it is good but only if you don't mind the fact that it almost certainly won't be accurate.
Like Dan I think that should easily be enough to lose weight. You are far more scientific in your approach than me. I have just tried to clean up my act in terns of what I eat (not that successful for much of the time) and make sure I run 3 or 4 times a week.
In four months I have lost 23lbs: Originally 18 stn 3 lbs down to 16 stn 8 lbs. Not prolific weight loss, but achieved without too much effort so far. I still have a takeaway once a week and the odd bar of chocolate. I try to focus more on my workouts and what I am trying to achieve in them and the weight loss seems to happen as a consequence.
Now you have run 10k twice why not try and time yourself over 5k?
I bet you will be pleased with the result. At the very least it will give you a much clearer idea of what you might be capable of over 10k once you have properly trained up.
In the build up to a 10k you should be running your longest distance quiet slowly in order to build endurance. It is initailly your time over shorter distances that will indicate and produce any improvements in speed.
Try not to be so impatient with yourself. That way only lies disappointment.
Build steadily and you will get their quicker than you think.