we have 3 735XT in this household. all i can say is it's has been pretty good. battery life is quite long (i charge 1-2 times a week), lightweight, no non-sense approach (comforable strap, easy to replace). the only downside is that i mainly swim in breast stoke and the GPS signal is not strong enough to track that outdoor. but this is not unqie to this watch, only apple watch is capable of getting gps signal in water.