the watch have perform well and have a lot of feature . the menue be very intuitive and easy to use . my only complaint be that one of the pin that hold the watch to the strap pop out when I be try to squeeze through a door - not as strong of a design there as I would have like . the watch also seem to loose satelite more often then the Timex Bodylink that I have . but I consider it a better watch and it be a better value than the 305 .