i like the 3d target. with that, i shoot a lot of arrows at regular targets too. i can hit where i aim, but the 3d will allow me to just reinforce exactly where to aim. and it helps to show you angles and shot placement from treestand heights and quartering shots.
i think they are more important for kids and beginners as far as helping them pick a spot and not aim at brown. but they are still fun. i picked up a rinehart broadhead buck on ebay pretty cheap and so far so good with it. i like that the entire deer is foam for when i want to let kids and beginners shoot it. plus if you really want to you can carry it to your stand as a decoy, and shoot a field point in it for realistic practice after every hunt.