very easy to use distance watch for tech challenge runner like I . I want a watch that be comfortable on the wrist , easy to see and even easier to calibrate . the 110 fit my need very well . have not use the heart rate monitor yet but that be just a ` nice ' to have , not ` need ' to have . I run along the beachfront and just want a gp product that give I basically time and distance . period . about the only I do not care for be the extra step and button I have to manipulate just to turn it off when the run be do . but if that be the extent of my discontent , then I be a happy camper . would recommend this particular gps-enabled watch in a heartbeat .