they can surely help...
but, do yourself a favor and buy some good FRESH estrous from a good deer farm...leave the stuff on the walmart shelves to collect dust...
run a drag line and hang a couple scent wicks in your lanes around your tree...
i started the fresh estrous stuff last season and im amazed every time it works...ive had numerous bucks hound dog my drag line these past 2 seasons...
its also a rush when you get one to run into calling...i call every hour or so...i start by hitting the can a couple times..then a minute or 2 i rattle and grunt at the same time...
the calling has worked for me the past 3 seasons...im sticking with it...