Hi Ian,
I realize you didn't address this question to me, but I will throw in my 2 cents.
I bought a JCut 6090A and like it very much. It is very accurate. I had oversized motors and screws added and had a 2.2kw spindle added so it is not the stock model. I should have tried the NCStudio software before I took it off, but I did not. I converted the machine to WinCNC because that is the controller that I am familiar with.
I have not had ANY problems with the machine. Mechanically it is very sound. I dealt with Mandy.
Good luck,
Butterknife
From Wikipedia - "..butter knife..any table knife designed with a dull edge and rounded point". I've never claimed to be the sharpest knife in the drawer!