The flash has plenty of power, and is intended to be on par with the 580EXII. It works well enough in that respect, but it certainly not a Canon flash. The touchscreen is rather a pain to use. Also, the flash is not fully compatible with the PocketWizard FlexTT5 system.
Consistent Output; Lightweight; Powerful Output
Incompatible Wpocketwiza; Not Work W Pocketwizard; Slow Recycling