You certainly won't go wrong with that suspension. And, I have to admit, there is something about the aesthetics of whoopies that appeals to me. The only drawback of this particular system is that it is slightly less versatile than using a marlin spike hitch, because the whoopies must be attached to the end of the tree straps. A friend of mine uses the whoopie hook complete suspension, and he has been very happy with it.
I have walked myself into my best thoughts, and I know of no thought so burdensome that one cannot walk away from it. -Soren Kierkegaard