I've had my E-M5 for less than 24hrs and I can tell it's a winner - a significant step up from the E-P3, another camera I loved. I haven't seen any comments on the EVF 'blackout'. Some weeks back there were posts elsewhere referring to a long blackout after each shot - but they were pre-production models and not investigated. When I started using my E-M5, I noticed the blackout was longer than with my E-P3: two flashes of the 'writing to card' icon before restoring the screen - or about 1/3 to 1/2 sec. I'm using a Sandisk Extreme card - same as on the E-P3. Also, this is for single shot, no Review. What's interesting is that when switching to multiple shot, the screen comes back on almost immediately, even when the 'writing to card' icon is flashing. This strikes me as a bug that could be fixed with a FW update. In the meantime, the work around is to set 'multiple shot', say 3fps, so that a short press of the shutter yields only one shot. One other challenge: I couldn't get the APC cover off! It requires a special technique: on the left side (with the arrow), pry out (away from the hot shoe and toward the Mode dial) and back. Otherwise: very pleased! Other thoughts: 1. Hum - not an issue for me. 2. When using the LCD at waist, the Eye sensor turns off the LCD - solution: Turn of Eye Sensor (deep in Menu options), and make it a Myset for easy access. 3. Save battery by setting LCD to Off when using the EVF. 4. Buttons are quite easy for me to reach. I find it easier to use my index finger for both the dials, rather than the thumb on the rear dial. 5. Finally got it set up so that half press of the shutter initiates IS and Magnify remains on - a useful combination for fine-tuning focus on long legacy glass!