I use the AZ-EZ for alumin, rt hand helical which is 8 degree. Works fine for either 2" Blazer or 4" vanes, nothing annoying about it in my book. The AZ-EZ for carbons won't work on xbow size carbons, too small of a diameter. I don't know anything about the other two. There's a 4 part video on Excal forum on the AZ-EZ and how to use it.