I looked at all the other mirrors advertised and reviewed.  Most mirrors are for cars and are made out of plastic with a reflective coating and don't give a great image. I believe this mirror might actually made of glass.  I don't know if mirrors for cars cannot be made of glass due to regulations but I guess it does not apply to this product because it is for a boat.  I use it in an RV because the RV has no rearview mirror.  I needed a way to keep and eye on the kids without turning around.  The field of view is perfect.  The suction cup worked perfect and stayed on the windshield even when left up for several weeks.  In side the accordian rubber boot is a series of nuckles to get the perfect bend and you can tighten the nuckles if you you need to. Over all this mirror worked perfect.  Not only is this a value, but I could not find another mirror at any price that would do what I needed to do.