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No experience with those. I've used some third party flashes. On Canon, I've used Sigma flashes, and they work well, though I found native Canon flashes to produce a more consistent and accurate exposure in day to day shooting, so I switched from the Sigma EF-500 DG to the 430 EX II. When I switched to m4/3, the native flashes all had some downside or tradeoff I didn't want to make for the price, so I opted for the Metz 50 AF-1, which has been a very good flash (though somewhat large on a m4/3 body).