What I like so much is that I can fiddle with different scope reticles on various rifles, and don't have to go to Cabela's to see the reticle. You got an old Soviet scope with a combat reticle...no problem if you know what it's called.
As a matter of fact, I'm just about to change my POI on most rifles to 200 yards again. Decided I like it better, and I'll then know (in theory) what the lines and dots correspond to. Pretty handy app.