I use hypersync with my Canon t1i... I can sync the flash all the way to 1/4000.
The cover photo on my web site was taken at 3:00 PM on a clear sunny day. The statue is at the entry to the old Union Station in Tacoma WA. The photo was taken at 1/1250 aperture 4.5 ISO 100. I was able to make it look as if it was a night shot, with a dramatic stage lighting look. If you look through the photo's in the Elma Fair tab you will see portraits that were shot the same way. Look at the second photo in the Elma Fair / Bunk House Tab... The gal with the horse came out very nice... note this was with full daylight ambient light in the barn. Also look at the Rain Forest tab...go to the end of the photos in the line up. The flowers that appear to be in the dark, were shot in full sun light.
To see photo's ......
RicksCanvas.com
The photo's, "It's all in the Lighting", tab were all Hypersync, with a comparison photo just using the existing ambient lighting. Let me know what you think...