It would be best if you could try one out before you purchase one. They are pricey, but seem well built. I have the original size in a four panel. Now there are multiple sizes available and a six panel model. They do work great as far as blending in, but they can be a bit more difficult to shoot a trad bow from. You have to be far enough away to not have arrow interference, which leaves me feeling a bit exposed from the sides, and it can be tough to shoot over depending on your stool height. They are also not the best option on windy days. If you do get the original four panel, do yourself a favor, and buy the carrying case for it! It is a big pain to carry with a strap over your shoulder and trying to maneuver it through brush while carrying your bow, quiver, stool, and maybe an extra jacket.
The backpack method is much easier and quieter.
All in all, it's really no different than carrying in a treestand or pop up blind. Like other methods of ambush hunting, they have there place, but are not a one size fits all solution.