.
I have used them in the past and was reasonably impressed with them.
I would add to the above, it is strictly speaking the relative ‘cutter to table movement’ as some machine the cutter moves and not the table. this is especially important when deciding whether the movement is say plus x or minus x.
i always think of it referring back to graph paper and if the cutter is at X=0 and Y=10 and you want to go to X=+10 and Y=0 then either the cutter has to move to the right 10 or the table to the left 10
I hope this helps Brian