I only used the demo version a couple of times, but it was very easy to get used to. Just make sure you switch between inch/mm before loading any models or tools. (I often ended up with a 50mm 3D model and a 3 inch tool, and wondering why it was only cutting off the 4 corners...) I did found it a bit expensive for my use. The software would be several times more expensive than my hardware.
(P.S: for occasional use, you can save the milling path as a text file using an openGL logger. you will need to write a small program to convert openGL vectors to g-code or similar. Maybe visual mill should reduce the number of decimal places before sending it to the windows openGL drivers, you're not going to see 0.000001 mm on a computer screen anyway)
http://jwstolk.xs4all.nl/mill.htm