Main issues have been tuning the servo without dedicated software and documentation, i'm still far off on this and i'm not really taxing the drives which is a bit concerning. I know Clive has been having problems with large >1mm following errors on high speeds with step/dir setup and there are reports of several people having some interference issues with using them in step/dir.
Nick you are correct but I am in discussion with Peter he tell me the ping times are too high 0.35. I am now looking into that the PC I am using might be crap.

But not given up yet.