I put it on one of my sites a long time ago, but never had any conversions, but then I didn't get much traffic to that site anyway! I've heard people complaining about it, for example, the cookie isn't set for long enough. I guess a major advantage would be that Amazon are well known and trusted.
I'd be concerned about what happened if you referred someone to Amazon who was already a member there would you still get commission? If not, then this could be a major stumbling block.
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