The Yongnuo ones work brilliantly, I have never had them fail. I have used them on a 5D2 & 5D3 with a 580exii. They are less reliable with a 430ex (which is the other flash I have) but would be fine with a mk2 version.
The only reason I am selling mine is that I am moving onto a different flash system with inbuilt triggers in the flash heads.
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