I use a Cobra. I shoot a extremely fast bow. Over 300 fps with a 400 grain arrow. It is good from under the tree to about 30 yards. Past that its not accurate. I cant imagine anyone getting anywhere near 40 yards with one. Where I hunt it is so thick i cant shoot past about 20 yards anyway.
I would recommend one for treestand hunting, but as soom as the season is over my Copper John goes back on. Mine will be back on next year, as Im out of tags this year.