I wear this watch to work (construction site) so it goes through some rough environmental conditions (sun, rain, dirt etc.) , hence the low price advantage. watch works great and does what it is suppose to however i am giving it 3 stars because it is not mineral insulated screen; and in my search i specifically typed for MI glass watch so i will not scratch the surface. Overall happy, for what it is worth i plan to get couple of month out of it before the screen is unreadable.