After having a defective FFP version of this scope, I decided to give it another try so this time I went with the SFP scope and wanted to do it justice and say it's great. Clarity is very good, initial tracking check looked good, parallax change doesn't change poi. I noticed the parallax knob has SER screws and can be calibrated and changed. So I took my rangefinder and without looking at the distance on the knob but just making adj til no parallax error and to my surprise from 10 to 100yds was dead on with the markings. Nice attention to detail. My only complaint and a minor one at that, is the narrow fov, but I'm getting use to that.