I've been testing out the ENO Helios suspension and want to make you aware of what I consider to be a design issue that can make them a little difficult to set up. Because the whoopie is actually attached to the end of the tree strap itself, you can really have a problem with setting them up unless you are hanging to a tree that is of a perfect size. Because they are attached to the end of the strap and, therefore, not adjustable up and down the length of the strap, they are either too long or too short most times and require some major fiddling around to get them right. You can make them work correctly, however, you will have to modify their design. I would recommend going with a standard whoopie suspension instead of the Helios if you intend to use a whoopie suspension. It will set up faster and with less fiddling. If I'm looking at this wrong or if you have better ideas on this setup, please let me know.