Pack Rack here too. Easier to carry, so more likely to have them.
They work too. Called in many bucks with them.
IMO I have a hard time believing deer really care. There is lots of odd and variable sounds out in the wood - real and fake - including ones that come from real animals. Its hard to believe deer can tell or are "picky" - especially since the reaction to these calls is hormone driven.
I also don't think a pair a sheds, sounds like horns attached to deers skulls either...but that is for another time.
To quote a buddies dad, when the turkeys are ready to come to a call, you can call them in with a kazoo. Over the years I think that about most calls...sometimes they will respond, sometimes not...the call is not that big of deal or is seldom the reason.
Now there may be an argument that some calls go out further, but tone is a tough call for me to believe.
I also think when rattling - the pace and other sounds (sticks breaking, leaves rustling) make more of difference than the device used.