You can probably get the info you are looking for by researching state agency websites and talking to state biologists. That said, Epic has hired a lot of former state biologists, especially from Utah, so they have a lot of knowledge, research skills, and connections to other biologists and hunters.
If you have the time and skill to do the research and make the calls then you can do it yourself. If you don't want to spend the time or get in to the nitty gritty of state management plans and making a ton of phone calls then you should consider using one of these consultants who have connections and have already done the research.
I haven't personally used Epic of Hunting Fool. But only because I am not hunting much out of state right now, so I can focus on a couple in state units and spend the time to research them thoroughly on my own. For $100, I plan on using Epic as I start to use my points in other states.