I have used the feature on an Oly. I like it! Great for getting that proper instant of action. Right now, the best I have on an ILC is firing off a burst on a 7D2. This gives me 3X the speed!I think we can be pretty confident that the 30fps burst is in there. It's demonstrated in the leaked video, and that seems like a lot of work for a fake video that ended up on Canon Australia's YouTube. It does note that there's a crop, but using a rolling buffer to capture images before you even press the trigger means you will capture the action you're after. I know it exists on other cameras, but I always thought that it would be a killer feature if used correctly.