Thanks for your quick reply's
John,
portability's not really necessary, so compressor less will save a few green beer tokens I suppose.
jb3cx,
I think whether it has an on board/separate compressor you are still going to have the same problem if one of the functions goes belly up you wont be able to use the cutter.
Pete W,
I haven't bought a machine yet just testing the waters.
shipto,
that's interesting could it have been that the on board filter was not big enough, that is worth taking into consideration when I buy my machine.
Thanks John W