The Yongnuo 568 EX II has sufficient light intensity and for me is the price-performance really absolutely fine.
There are only 4 stars because: in a 2 order units the translational guides for Batterieabdeckklappt were canceled. These are absolutely not coordinated with the resilience of the battery springs, thus is this defect probably occur more often. But what is expected of non-German engineers ....
Anyway, I'm in all purposes of use so far completely satisfied.