I like yarn type indicators and have used the NZ method. The pluses of this system is the ease of attaching and adjusting the depth and controlling the size of the indicator. Otherwise it performs like other yarn indicators as far as flotation and air resistance are concerned. I found no appreciable difference using the wool material over using polypro, and poly is a .heck of a lot cheaper. I use small sections of plastic tubing, IV tubing works great if you have access to some. As far as the insertion tool is concerned, I have not found it needed ( just fold the leader and push it thru the tubing, put the poly in the leader loop and pull the yarn into the tubing. I like it!