I have been using Huntwise for the past couple years and have really liked it. I paid for the deer prediction last year and it seemed OK. Love the maps and if you have anybody else hunting with you the group stuff is cool.
I think there are people out there that don't want to deal with the hassle of setting up arrows. Plus have the extra money to drop on the best products. These people probably shoot the newest bow every year with every Ultraview accessory on the market.
There seems to be a lot of people saying you don't need it because of all the dark timber. I am still planning on taking mine since there are a few ridges I can get to and glass into different bowls.