I added the Ares BTR GEN2 4.5-27x50 scope from Athlon Optics to my Precision Rifle. Once I read the instructions and learned (the basics) to use the MRAD system, the unit was incredibly easy to work with. I couldn't be happier with its performance. The glass is clear, and the light is bright and vibrant. I didn't have any issues with the glass fogging up or losing a sharp, crisp image. I prefer the FFP version, and this optic did not disappoint.