I wouldn't bother, I tried them on my oil cooler and they wept quite well, got them swaged on after a while, but then I just used them to get the truck running
Setting, for me, was putting the pincers in the vice, was the only way I got enough force to crimp them down properly.
Yes they are easily removed, cut vertically through the ear and they fall off.
They are pretty intolerant of pipe size, I don't remember too well, but the range was something like 16-19mm, i.e. small compared to hose clips.
Personally I would invest in some stainless hose clips and not have to do it again