My superfly arrived a few days ago, and I've set it up a few times as well. I use the 2 part ridgeline, and it works great. I used knots a few time, but I had a couple of figure 9's, and they make setup and adjustments a breeze.
All I do is have a bowline in one end of the rope, pull the rest through it around the tree, and then through the tarp rings, and tighten with the figure 9's. I'm able to get a nice tight pitch.
After doing it this way, I can't see why I'd want to use a continuous ridgeline with this tarp.