I bought my gold aluminum 38mm watch on Saturday. I seriously love this watch. I ran my usual route today, which I thought was 3 miles according to my old AW. I do it in about 28 minutes which is not too bad for a 56 year old retired Marine female (that's the minimum passing time for a young male Marine). It appears that my old watch was way off and my usual route is only 2.5 miles. I realize the disparity is likely my fault as I never bothered to run with my phone to calibrate the watch (I don't like running with a phone). I just assumed that my watch would be calibrated well enough on my usual hikes when I have my phone with me.