I have the Calumet Genesis 400 (same thing) and a Neewer equivalent as well. They're really well made flash units, the wireless transmitters work well, and they're quite feature-packed for the size and price. And the external batteries last forever unless you're popping them off at full power every shot. While they won't replace my studio pack/head kit (I need 2400 ws of power when doing large format portraits in the studio), they're perfect for on location.