For years I used that PMI (3mm) cord sold for about $5.00 for 50 ft hank at REI. It is thick enough that any knots are easy to handle and it grabs a Figure-9 okay. But last night I was looking at my alternate Dyneema. It is sure lighter - but that doesn't make it better. We have trees with thick (read "sharp") bark and those fancy fabrics (Dyneema/Amsteal) cut pretty easy under tension. If I were an weight weenie I might be more interested. I may make an ultralite setup I can just grab-n-go, but for most hanging purposes the thicker cord is just fine.
One thing I would have changed out if I hadn't already invested so much, is the guy cord. I use the Nite-eze green reflector cord and it isn't smooth. The reflecting part is like little chips that catch when sliding across itself when making knots. It's a small thing, but I'm reminded of that "feature" with each guy line I set.
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