I had the last 2.5 years, the Garmin 610 in use and use now for about 3 weeks, the new Garmin 620th
My first conclusion is absolutely positive.
I think the Garmin with this clock has made everything better, which was not so good at 610.
The first impression is with regard to the quality of the clock well, the clock is significantly lighter than the 610 and makes use of the used strap through the case a solid impression (the quality problems of the 610 series should no longer occur here)
The functions of the clock are really very extensive and one (s) can enjoy various evaluations and statistics.
The use of the clock is also quite easy and you will find yourself very quickly in the various setting cope. The GPS signal is received very quickly and the chest strap is comfortable to wear. Genial I also find the WiFi function to transmit wireless data at run GarminConnect taking this function works perfectly for me.
As previously only negative point is maybe noted that the colors do not appear as clear as in the photos but that point is to be absorbed.
My conclusion is: The clock is expensive but also makes a lot of fun, it offers a lot of useful applications so that the running training more effective and more motivating will. For me, the best currently on the market and Running Watch a strong buy recommendation.