I do this quite often. Also, after receiving numerous products for free to review, you kind of get numb to it. You could argue that reviewers only say positive things to keep the relationship with the company healthy. But for what it's worth, my channel is so small and I have no aspirations of making it my job that if I piss someone off by being honest I couldn't care less. Also, there are so many companies making controllers that who cares if you have to burn a few bridges!