I use this external flash unit with my Canon Rebel xTi. The flash does a great job calculating the amount of light it needs to release to expose the photo, making grossly over exposed or underexposed photos a thing of the past. The ability to bounce the flash off of medium height white ceilings gives you great looking photos to the point where I now prefer using my flash instead of relying on high ISOs, fast lenses and low aperature numbers. Although flash photography is a tricky subject, the casual shooter can leave this flash in automatic mode and get wonderfully exposed photos. However, in my opinion, the BEST PART of this external flash is that it enables you to focus MUCH faster than the built in flash and this is reason alone to pick up the Speedlite 430EX II. Previously, when shooting in low light settings, the camera/lens would struggle to focus and the flash would emit several highly annoying test flashes. The Speedlite has no problem finding and focusing on your subject in low lit catering halls and dark rooms and it does so without the annoying test flashes. Great product.
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