When I used 10 lb test, the bees chewed through the line. It was actually pretty amusing watching them look like kites flying when they would tug and pull on it from outside the hive trying to get rid of it from the frames. I also tried using it to "wire" up some cut-out frames. It was too stretchy and the cut-out comb wouldn't stand straight up in the frames.
I switched to 30 lb test and it works great. After two years and 200+ frames, not a failure yet. I use an "X" pattern on both sides of crimped wire deep and medium foundations. After I thread it, I put two throws in the free ends and tighten it as much as I can. Then I draw the free ends over the corner where the side bar and bottom bar meet. Throw in a staple to secure it and done. One interesting pattern I found is when I hive a swarm or nuc with foundation only, the bees chew the wax exposing the "X" in the center of the frame. Seems to be less of a problem when I feed sugar syrup or add it in supers. Nice and stout for cut-out frames, too.
Hope this helps.