On my opinion Hi-watt CO2 is still slow on cutting metals compared to a Hi-watt fiber, plus the fiber only uses hi voltage, so there`s no depletion, on the other hand the CO2 keeps on getting slower and slower in the long run because of gas depletion, plus fiber is cheaper compared to CO2, a simple buffing process on the edges would`nt hurt if you are worried about it, bottom line is the fiber is faster and more consistent type of machine.