I'm not certain what a QTN 250MSY is however, High Pressure Coolant has MANY benifits.
Better finishes, longer tool life, shorter cycle times, ... etc.
The largest drawback from any High Pressure coolant system is the filteration. You'll also need a little more preventative / proactive maintenance.
However, I do need to ask; who is telling you that 213psi is considered "high pressure"? AND, if you're used to working with pressures under 50psi, what are you cutting and cutting with?