Always disclose your affiliate relationship. Most visitors will probably understand that graphic ad will lead to your getting paid, but if you write a review or use an in-text link as a recommendation, you want your readers to know that may lead to compensation as well. This ensures you retain transparency and trust with your readers, but also, it's required by the FTC's endorsement rules.
PeerFly only has a limited number of products at the moment, but they have tremendous momentum and are growing by leaps and bounds. Their payout rates aren’t spectacular, but everything is upfront and transparent, and affiliate satisfaction is very high. PeerFly is perfect for authentic marketers who want to offer high-quality products to their visitors as opposed to “get rich quick” schemes and opaque offers.
I concluded that having read a product review, people felt more informed to make a purchasing decision. As a result, if they did click a link after reading the review they were more likely to buy the product. Those clicking on the top link seemed to be more in a ‘surfing’ mode. They clicked on the link less because they wanted to buy it but more out of interest to learn more. Some bought the product and some bought other products once they were ‘in the door’ at Amazon.