Some good tips. I fully agree that it’s all about trust and it is always good to recommend an affiliate product that you have actually used. Why risk your reputation on a product you don’t know if it’s any good or not? If people buy one dodgy product from your site, they will probably never make that mistake again. That it why my blog strongly advocates ethical affiliate marketing. It’s the best long term stragey for affiliate marketing success.
If my piece of content is so unique and valuable around hiking backpack recommendations, that other reputable outdoor websites are willing to link to it and build the page’s authority, then I’d have a very real opportunity to rank high in organic search for these search terms (meaning, my page will come up first when someone searches for hiking backpacks).