It really depends on what you want to do. You can use it as a compressor for a signal going into your DAW. You could use it as an outboard effect/compressor/expander when tweaking your mix, you could use it as treatment of your audio between your mixer and amp BUT you'll get a very wrong imression of how you mix really sounds.
I think the time for such gear is gone.
Use it on your living room stereo or with your stereo DVD player maybe.