Of course once you have an accurate plug-in you can take your virtual Fairchildren and use them as channel compressors until your DSP gives up. Equipment which is often vintage and sometimes so rare and eye-wateringly valuable (I won't say expensive because that suggests it's for sale and in the case of a Fairchild, even if you have the money, people who have them aren't selling!) that most people haven't seen one in the flesh, let alone used one. What I mean by that is that UAD are best known for meticulous software recreations of classic analogue equipment. If for no other reason that this plug-in is the most UAD-ish of all the UAD plug-ins.