I just couldn't make them work correctly. I had a hard time getting the webbing to slide very well if I had to make an adjustment after weighing down the hammock. In part, I think it was due to a wide diameter tree that I was tied to. The angle of webbing coming into the tri-glides was fairly severe.
Pan and Smee both made it look effortless, but I couldn't get it down for whatever reason. If I remember right the edges were fairly sharp, which made it even more difficult to adjust the webbing. I think maybe under different conditions and a bit of practice on my part, they probably work fine. Like I said, Pan and Smee made it look wicked simple; there's gotta be a trick.