There are 2 thigns I don't like about it but I beleive this is true of all, or nearly all GPS watches.
1). the GPS is less accurate than my phone, yet this was one of the main reasons I wanted a GPS watch. for Casual running this is less of a deal but as I run more seriously it gets frustrating. Friday I ran 16.8 miles, measured using geodistance.com. My phone reported 16.6 miles. The Forerunner 610 watch reported 16.1 miles. When working our my pace and timing that is a big error. Today I ran a load of lopps on forest trails so I have no idea of total true distance, my phone read 6.7 miles and the watch 6.25. my estimate would be over 7 miles true distance.
However, fromextensive research this is about as goo as you can get.I think only thr Garmon 310Xt with the fotopod attached is any better.