On 5.3. ordered. Yesterday it arrived from Belgium. Have it for the Canon 450 D - so amateur camera - bought. Fits perfectly. Absolutely stable housing, the battery cover can be closed completely and is robust. Otherwise - Put on camera, tighten, press ON (takes about 3 sec.), Making the camera ON and images. Has everything worked well without German instructions. For me as an amateur photographer, the flash unit is an absolutely rewarding and above all cost-effective alternative. Technical assessment I can not deliver due to lack of knowledge. But there is a good guide to a well-known portal to view.