Ive heard a lot of good about vortex mostly from the gang here on cgn, but ive read a whole lot of bad about them, hence why ive never ever bought one.
most people say aimpoints are good for close range, i prefer a trijicon rmr, or an eotech personally.
I own aimpoint, trijicon, eotech, browe and elcan, and out of them all my aimpoints are the ones that spend the most time NOT on a rifle, just too blurry for me. I know, I know, Im going against what everyone says, aimpoints are the best blah blah. Frankly they are just a blurry line for me whereas my other red dots are clear crisp dots.