Well, when you think Google AdSense is the hardest way to get money online, then you should think about paid review. But, never join to a paid review program just for money. You should consist to your blog readers as well your contents. Don’t let your credibility fall down to the earth by writing a review that irrelevance to your niche. Yes, you’ll earn money posting the review, but your readers would leave you because they know that all you want to do is make money fast.  Just think about it, your reader is everything. Don’t annoy them with an out-of-topic paid review posted on your blog. Then, your content is a king. You can still earn money writing review without losing your readers or breaking your blog consistency. The key you need is, be selective in order to make money fast.