I bought this last weekend, and used it during my San Diego Rock N Roll Marathon run. It helped me keep my target pace, and it seemed to be very accurate. I use the interval training feature very frequently, and the virtual partner option is helpful if you want to push your limits.

I did not use the heartrate monitor just yet, but I soon will during my future training runs.

This GPS-enabled sport watch tracks your training, then wirelessly sends your data to your computer...Thats not all this watch can also Track Heart Rate, Read more by following the link>>>....$350.00