The initial inaccuracy of the GPS of about 500/600 meters minus to 16 km has improved to 180 meters plus in today's half-marathon. With 21.095 KM 21.280 KM were displayed. There were at each kilometer mark on the track is always so about 10 meters more on the clock. My normal running routes are mainly in the forest and thus it will probably come to these inaccuracies. I can not quite understand, because a GPS signal has been consistently available, but that you have to live well, if you want to have a GPS clock this. There were problems in my tests with watches from Suunto and Polar also and that cost more than twice as much. For the GPS performance, there are 4 stars.
The clock is good to use after a short period. Although it is very clunky but not too heavy. A larger screen and a little flatter would be even better, but the successor is determined. In three lines it is easy to read, with four lines will be more difficult. There are also 4 stars.
The transfer to the PC is no problem. There are 5 star.
I can recommend the clock and give a total 4 stars, because the configuration of the clock is directly a bit cumbersome. About the Timex Device Agent it comes easier to you but not going on trips. In addition, the localization is done only partially or not at all.
HOWEVER, buy and try it by your own! I could imagine, you will never run alone anymore.
Keep on running!