Works great for adjusting the preload on my 2016 Dyna. Put on gloves - you may have to squeeze them tight or slip and bang your hand on the bike's metal.
I like that it's nice and low profile so it's easy to pack in a tool box. The finish is excellent, the movement is good. However, the jaws are too small to fit around my shock collar, so it's useless on the latest Sportsters. Otherwise it's pretty cool. The installation guide in the list will help solve this problem.