I run A520s on my road bike and I love them. For many of my other bikes where I prefer the convenience of double-entry, I use M424s. I also prefer the M324 over the A530 for applications where I want a platform on one-side and SPD on the other.
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"Let us hope our weapons are never needed --but do not forget what the common people knew when they demanded the Bill of Rights: An armed citizenry is the first defense, the best defense, and the final defense against tyranny. If guns are outlawed, only the government will have guns. Only the police, the secret police, the military, the hired servants of our rulers. Only the government -- and a few outlaws. I intend to be among the outlaws" - Edward Abbey