Agree, this is really a break through. I used flash a lot before. And I always thought it was a huge set back when digital cameras suddenly meant going from 1/250 or 1/320 to 1/200. Now we can have the fabeld 1/400 for swirly hair and skirts, swinging bags etc.With that said, there is a feature or two that, my opinion, given how I use my camera, worth mentioning.
These are: 1/400th sec mechanical and 1/200th electronic sync speed.