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They did change their links this year to dynamic iframes with images that include an intrusive logo. I'm not yet seeing an effect from this on early sales, but will be keeping an eye on it.
They have paid on time, always. Never a problem. They definitely have the best selection of goods, and their commission is high (compared for example to amazon).
The only drawback is poor reporting - you can't get info on what has been clicked or what has been bought - I can't even track separate sales for my various sites.