I run a 3-15 gen 2 pst on my 18" AR and another on my secondary 22lr, 3x will let me engage as close as 20yds realistically if say a groundhog pops out of a ditch line, but can also dial up to 15x and make a 500+ yard shot as long as you aren't shooting at golf balls.
Reticle isn't as fine as a 5-25 pst g2 or a 4.5-27 razor, but for the optics purpose it doesn't have to be, actually helps some when zoomed out shooting closer. Clarity is pretty good, may even pick up a little more light than the 5-25.