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I have owned and still own multiple canon flashes. 550, 580 MKII &II, 430 MMKI & II, etc. I liked all of them within their limitations. I will always recommend purchasing the most powerful that you can afford. That being said, I've had a Nissin Di866 MKII for about a year and really like it. It plays well with Canon flashes and my 7D and has as much power as my 580's. Plus it's a lot cheaper and has a small fill flash.