Summary: It is a very good device However As I have read before the battery door does open from time to time for no reason. Poorly designed door on battery compartment which should have been an easy fix or design in the first place to secure the door.
Summary: The rangefindeer works great . It's fast and accurate. I don't put a lot of faith in the slope feature. I, too, have the battery compartment open on its own on occasion. Bottom line, great product.