I find the Mueller APV I have is a big step behind the Nikon Buckmaster I have. The resolution is similar, but slightly better with the Nikon. The color transmission with the Nikon is much better and more true with the Nikon. The turret adjustments are MUCH better on the Nikon. They are more repeatable and more accurate. The APV turrets aren't as bad as many China made scopes, but they don't compare to the Nikon. The brightness of the image is much better with the Nikon as well. The Monarch's I have seen are a step above the brightness of the Buckmaster's as well. It isn't much of a difference at 2pm on a sunny day, but get in a situation where light is less available and the Nikon stands out.
I personally feel the Buckmaster is more than twice the APV, but it also costs more than twice the price. The APV isn't bad, it just isn't the amazing buy that some make it out to be. I'm not disappointed I bought it, but I certainly would buy better if I could afford it.