pro 1 . Works well for total distance\/pace . 2 . the logbook software be excellent and easy to use . 3 . really help to keep mileage in you target range to avoid overtraining . 4 . battery charge work really well . -lrb- I do 8 run and still show 13 hour charge time leave -rrb- . 5 . do not have a heart monitor . -lrb- I already have a heart monitor that work very well when I purchase -rrb- . con 1 . the pace feature be not good in real time . I have try both `` most '' and `` least '' smooth setting with suspect result . the avg pace that be calculate at the end of you run be good however . -lrb- real time pace bounce up and down . I would sometimes see a pace of 6:31 and seconds later see 8:24 without change my run speed -rrb- . 2 . unit be large but light . you do not even notice it while run . 3 . should have usb port instead of com port . 4 . take several minute to lock on to satellite . -lrb- I always warm up with a 1\/4 mile walk first which work for I -rrb- . Summary this device work very well for I . I would buy it again .