Most reviewers either use Canon or Nikon, so they see things through that camera, and many of those camera have an instant startup time, so they see the time it takes the Oly E-system to startup as a bad thing.
However, the Oly users KNOW that the little extra time it does take to start up saves much time later having to clear dust specs of an image on the computer, and the time it takes to clean a sensor by hand.
Anyway, the "longish" startup time has never bothered me or most Oly users because when you think about it the time after you've flipped the switch on the camera, it's less time that it takes to put the camera to your eye, frame the shot, zoom the lens, reframe for the zoom adjustment and position your finger over the release button. After doing all that the dust cleaning proceedure has been done and the camera is ready to shoot. Anyone who takes less time to do all that isn't a good photographer and just a snapshooter!
In other words, while the camera is starting up you're not just there waiting for it to be done, you can actually put the camera to your eye and prepare to shoot (although after the "dust buster" has done its thing you should allow the extra second for the dust that was shaken off to fall down, so for landscape shooters you have to wait the two seconds it takes the camera to start before rotating the camera to shoot.
The startup time is just a non-issue for better photographers. And yes, the dust buster does work, we have E-1 users who have owned the camera since it came on the market (over two years ago) and have never needed to clean the sensor by hand in all that time.
