After a decade of more of use, my US Optics 15-40x60mm FOS ( Field Observation Scope) suffered a failure. The magnification ring froze up and would not function. I contacted US Optics and they immediately sent me a RMA and I sent them the scope. In less than 2 weeks, I received the repaired scope. US Optics has done a complete refurbish of the scope to include updating some components. It is now better than new. I wish to commend US Optics for standing by their products. I wanted Hide members to know my experience that US Optics stands behind their products with an awesome no nonsense warranty. US Optics communication, service and repair are outstanding.