I use the flash on my E-PL1 and E-PL3 with absolutely satisfactory results. Small and light, it is also more. Although you can not adjust to the part a lot, but that one does not need also. The collaboration with the PEN's works flawlessly, no matter what ISO, aperture, focal length or distance to the subject you use. The charge goes very quickly with the eneloops batteries and you can safely plan losknipsen at parties and weddings. Even with the telephoto lens (40-150mm MFT) you get everything super illuminated on the sensor. Without problems reach are there ever loose up to 10 m in there. The AF assist lamp in the flash is a bit meager equipped and oriented somewhat nonsensical. No matter, I did not used. Great recommendation from me. So simply can flash photography be (for amateur claims). Addendum dated Jan. 2014: also at the E-M5 does the lightning excellent as expected. Still have not found any negative qualities. Greeting AZ