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I've been runing a Hitachi for some years. Basically problem free. One word of advice/caution. Make sure you buy one large enough to handle the starting load of the spindle.

As explanation here is my issue: If I've shut the spindle off at say 3500 rpm there is so much start up load that the amperage draw faults the VFD. Research (filed under 20/20) shows that the starting amperage draw is equal to the MAX allowable draw on my VFD before it faults however, this MAX draw exceeded the allowable time value permitted for the VFD to operate at that level. Results in a drive fault. As a work around I try to remember to spool down RPM to 1000 or less prior to shut down.

sorry for the long post.

Owen

EDIT: I have noticed several posters asking about VFD location and access to. I assume this is to turn the device on and off to either activate / deactivate the spindle OR just simply turn it on for useage. To that end a comment that MOST VFD will have Analogue and digital inputs. Use the analogue inputs to trigger the VFD ON and OFF with simple open / close switching (or in the case of my mill I use the stock Start / enable switches) This allows the VFD to mount INSIDE the control box and be turned on / off from the outside.

peace