Own an M17. Its the predecessor to the C420 ..Uses a Fanuc 21i control instead of the current Siemens.
Love the machine. Has been money for my work (prototype and repair) Fitted with a Multi Fix post , very accurate and repeatable.
Romi "Guide" is easy to use and makes doing programs a snap, even for one off's. You and also program using
G" code if that is your pleasure...plus runs with "hand" control. Spindle on/off and feed , cross and long all off apron controls...just like a manual machine
Fit and finish are very good.
Can't say about the local support. Have had this machine since 2004 and have never needed any support, save the purchase of some way wipers and cabinet air filters which i get directly from Romi parts in Chicago.....
Cheers Ross