The quality was already praised here, so just my highlights: + On the Olympus E-520 I find the great flash because of infrared calibration (Auto Focus). For smaller flash (guide number smaller), or the built-in flash is repeatedly pre-flashes to focusing. Puts the Mecablitz 44 plan the photographed for the people happened almost invisible infrared. Recharging + Fast + Long battery life - I have two evenings flashed with normal Duracell alkaline batteries and only at the end of the second evening I noticed slightly longer loading times. (Guess there were so 150 photos with flash)