Working unit is inches.
Not sure if its a bug or what, but I have discovered something odd. After getting the Shapes Wizard working I cut a test on a block of wood (so I could cut it faster). The test was a simple relief (raised) circle. It came out distinctly lemon shaped. At a radius (radio) of .75 it came out approximately 1.5 by 1.3 with a distinct point at each end on the X Axis. Afterwards I looked at the tool path and you can kinda see it on screen. Its generated that way. I regenerated the tool path several times and went back to see if there was anything in setup that could be causing it, and could find nothing.
This gives me some cause to realize I'll need to make a test cut for every shape using this wizard before I can consider it as part of my go to tools.
P.S. Over the last week or so I have been testing all of the wizards that are suitable to run on my machine and figuring out how to use them so when I need them I can just do it.
P.P.S. For quick measurements and on wood I just use a dial caliper, but when the the error is so obviously visible its good enough for estimating purposes. I do also have a good set of mics from 1" to 6" with standards.