I have a digital phase converter. Its a Phase Perfect 20hp which I bought new in about 2008. Its been fantastic and trouble free. It feeds a 3 Phase Panel which distributes power to half a dozen machines. Its a good system. Phase Perfect is likely still the best system for 3 phase conversion. Its quiet, efficient, doesn't mind electric brakes, the power output is extremely balanced compared to say a Rotary which is good for CNC controls. Its a system you turn on and leave on while your in the shop. Turn it off when you leave.