Tim...
The difference on a 20 yd shot.....from 20 ft. up.....is +/- ONE yd.
I'm not saying it's not needed for ALL hunting purposes....but for your average bowhunter (and I think the shot I depict is a fair representation of "normal" bowhunting)...."I" feel it's not worth the extra $$ they are asking.
Again....just my personal opinion.
Good luck