The way the tool is made, as long as the relationshib between the leading edge and the index tab on the other end is the same. And as always - It's your choice to use it or not. I happen to have one of the tools, but I have yet to use it, so I can't personally attest to it's ease of use or accuracy.
I never cease to be amazed at how quick some people are to trash and/or condemn anything (or anyone) that remotely makes owning, working on, and driving our cars easier and more enjoyable.
I am not a master mechanic, and in no way profess to know very much at all about these cars. 50 years ago I looked to my Dad (who has forgotten more than I will ever know about Model As) for expert advice and help. Today I have to depend on my friends, fellow club memers, and the good people on this board to guide me. I consider what I have learned from these people in the past 1-1/2 years to be enjoyable and invaluable to the enjoyment I get out of my truck.