The Polar builds excellent running watches, nothing is new. However, to me the displays were far too small, especially since I am somewhat farsighted. The M400 has a nice big screen and the training view can be set individually via the Web service. The GPS needs some but not excessively long, because I've had worse. The functions of course not come close to the almost twice as expensive V800. Their vibration indication of the heart rate zones I would have liked but even desired.