This GPS device is great for calculating mileage and speed for runners/bikers. It is not too bulky to be worn easily on the wrist and is generally as comfortable to wear as a wristwatch. It’s a great running partner particularly on days when I run alone. The only con, is that at times it can take awhile to obtain a signal, but once connected it never loses signal. Although it is one of the cheaper GPS enabled wrist watches on the market, I have been very happy with the purchase.