I rarely write sponsored posts or mention links/products/services in return for payment but when I do this will always be disclosed.
From time to time I am offered the chance to review products or services to share with my readers. I only accept items which I feel fit into the theme of my blog content and may interest my subscribers. My reviews are always 100% honest and I test products as fully as I can before sharing my thoughts. I will always clearly mark items which have been sent to me for free.