King - Cleans build explosiveness like very few other exercises. They are basically a full-body workout, but as they're with lighter weight (relative to, say, deads) you can get a lot more speed and power into them. They're tremendously helpful with sports, too - as a wrestler I'm using them to build explosion for shots/standups, etc.

(That said you don't SKIP other movements for power cleans. I still squat, deadlift, bench press, MP, all of it - I just do power cleans on some days additionally.)