Strengths: Easy to use, come home plug into laptop and see exactly where you have been. Recharges in quite a short time, 2 hrs use recharged in less than an hour.
Weaknesses: When doing london marathon i set it as a marathon route, due to high buildings it got confused, i wanted to stop before Buck house as it said i had finished.............i did plod on to the end though.It can take a minute to receive sattelite signals, leave it on window ledge whilst gettin shoes on. Bikehike.co.uk course creator does the same job and is free.
Overall: Another great motivator, helps keep your training runs on track.