Dirt, I can tell you I have heard a lot of different calls in the woods (doe bleats, grunts, bawls, fawn bawls, buck grunts, snorts and wheezes) The only deer calls I make are doe bleats, fawn bawls on rare occasions, social(contact) grunts and tending grunts. There is no such thing as a estrus bleat or doe in heat bleat persay (these are simply doe bleats) and I have never heard a challenge grunt in my life while in the woods(not saying they aren't real just haven't heard one). Deer rely on other sense to communicate but do you use their voice box, the difference between using a call to your advantage and the deers advantage are very fine. Over calling, wrong sounds or response, poor setup to begin with are all to common mistakes hunters make and then blame the call for screwing up the hunt. A call should be viewed as a last resort in my mind, not the primary tactic in your bag of tricks. As such I use it as a turn/stopping tool vs a location tool(visual on a deer I want to harvest)...deer are curious and will come but all to often they will come in the backdoor and leave without you even knowing they were there. Only time I blind call is if I am set up and make a noise I think affects my spot or when rattling...the rest of the time I just sit and listen. I make a lot of sounds by mouth but I also believe in a grunt tube as well for tone variation and ease of use.

It certainly isn't magic I agree but it can and will buy you a shot if used properly in the right situation. Videos are used to sell products and I certainly hope we all know editing is involved and take the marketing efforts with a grain of salt when deciding if that particular product is worth buying for our hunting needs.

Any way that is just one 'Real Hunters" point of view, take it for what ever it is worth