Whether your feedback to companies is positive or negative, all is welcomed. Companies are open-minded in accepting different types of opinions, as feedback is valuable for their product development – to design a better/improve the current product. So don’t worry about “not being paid” if you provide negative feedback. Perhaps a company saw your opinion and was inspired to make a new product – and bang, a new generation of smartphones appeared.
I loved seeing the example of the Kids Tablet with Wifi utilizing affiliate marketing. It gave me some great ideas on integrating amazon for my own children’s blog. I would be interested in knowing how much they are earning monthly from their affiliation. Being a mother of a two year old myself, I could see myself writing reviews on Amazon products my daughter enjoys.