Construction fairly decent, not too "plastoche" energy efficient. Quick Operator in a language which the manufacturer must be persuaded that it is in English, but allows the use of triggers without worry. And it works very well anyway: with my flashes (Metz AF-35, 460 and Gloxy Yongnuo 985) all sounds like a mountain storm! Only (minor) complaint: the switch is no longer handled once a flash attached to the machine! I recently bought the new version, the switch was placed on the side. So 4 stars for this version 5 for the new version.