Firium is a linear phase EQ, which means two very important things: the first being that it makes it an insanely clear and transparent EQ as it is not adding any phase distortion to the signal, and the second is that it introduces quite a bit of latency, making it a less than perfect track EQ. Well where does this you? If your host doesn't support delay comp you're still left with the perfect mastering EQ. Is it that good? Yes. I defy you to listen to Firium and not be impressed with the sound. Curves are drawn in by hand, so as far as ease of use goes, this would be a hard EQ to beat. Secondly, Firium includes a spectrum analyzer in the GUI which allows you to spot out problem points in your mixes quickly, and also allows you to see how your EQ adjustments are effecting your mix. This is just an unbelievably clean, transparent, and sweet mastering EQ that bears no faults whatsoever in that task. Buy this EQ, and sound better. It's that simple.