I have to tell you though. I have been doing plyos for a while not. I was actually doing it before I even touched free weights.
Now when I go to my gym and do plyos and endurance lifting (low weight, high reps) all the huge roid heads stare at me like "WTF is that going to do for you?"
To them it will look stupid and pointless but it works on body parts that are crucial come fight time