"They use crap sources for carbohydrates. They probably use maltodextrin for their sugar, and claim it's a complex carbohydrate, but its glycemic index is just as bad as any sucrose."
Leaftye thinks Maltodextrin is bad. A large percentage of endurance athletes thinks it's good. You make the call. I trust the folks that can walk the walk or run the run or ride the ride.
Here's my take on this product. If you are looking for something to take during your hiking hours then I would look elsewhere. (Look at the ingredients in a product such as Hammer Perpetuem.) The product you listed has too high a ratio of protein to carbs for efficient hiking. Also, the 880 calories per 8 oz. is on the low end of the calories/oz range due to virtually no fat which is twice as calorie dense as proteins or carbohydrates.
Now, if you are looking to use this at the end of the day for recovery then this may be a good possibility in combination with the carbs in other food to recharge your system. Bottom line, IMHO, primarily carbs to hike, protein for recovery.