It'll come in handy.....if you plan on hunting 60'+ in a tree......or if the differential = that or more on a hillside (tough trail you're on, huh?).

If I had to pay more for it....I wouldn't pay it. If I gun hunted at all (I don't), I'd get it. If I only bowhunted, I wouldn't give it a second look.

Run the numbers for yourself (Pythagaorean Theorem).

EDIT*****

Here's a scenario I ran for giggles....

Let's say you're 20yds up in a tree (yeah....that's 60'). Let's say your target is 60yds out. To compensate for the angle....your actual yardage to your target is a little over 63yds.

Worth it, to you, to know that?