I'm not sure of the intricacies of journalism but imagine that the manufacturer pays for products to get reviewed and ultimately has some say in the wording in the review. Could be naive of me of course.
Interesting point. I doubt they actually
pay to be reviewed, surely then any question of an unbiased review would go out of the window? On the other hand, I assume the manufacturers
offer products for review, and nothing is ever being reviewed without the manufacturers' prior knowledge.
I also doubt the manufacturers have any editorial control, but I imagine there are some "discussions" before the review goes to print. Especially if there is some problem or defect with the product, you'd probably want to give the manufacturer a chance to respond. And in that case, maybe some of those issues never make it to the printed review.
Having said that, I've read
many reviews which
do refer to a flaw and say something like "the manufacturer has assured us that the problem has now been sorted out and won't appear on the samples you'll see in the shops".