The frequency varies depending on the platform, but you should expect a trickle rather than a flood. Additionally, while most product testing companies allow anyone to sign up for free, you’ll only get products to test and review if you meet the target demographic for the product. This can be frustrating, because even if you are a great reviewer, you may go long stretches without any products or freebies. For this reason, product testing is best suited for patient souls who are looking to occasionally get some cool, free stuff — not those who are looking for a consistent side hustle. If that's what you're searching for, check out our list of the best side hustle ideas.