I just didn't feel like they added anything that I could not do more simply with some good old rope skilz. If you want to do a single ridge all you need to make it super fast and simple is a few of the smallest mini biners you can find, 30 or so feet of light cord and a few prussics. Tie loops in the ends with what ever knot you like, I usually do a overhand figure 8, and put one small biner on each loop, rap the tree and clip the biner back on the running line. Then with another biner clip two prussics together like you would for a crevas rescue rig with one minding the other.
Like this (sorry camera focused in the wrong spot.)
Then you can attach your tarp how ever you wold like.