No comment on the can as I have never used one. However have used bleats by voice to stop deer. Like any call they have to hear it to react.
In regards to rattling I've had lots of success however you have to be in an area where the buck to ratio not out of whack. If their is no competition to breed they will not engage in a fight unless they absolutely have too. Set up and timing is key as well.
Calls & scents aren't foolproof or 100% guarantees, sometimes they work and others they don't without reason often. Just like a fishing lure.