Bought this as a much cheaper alternative to the £16 cables on the Apple store. Not sure if it's a genuine Apple product, but in all honesty it does exactly the same job and looks the same, matching the aesthetic of a white MacBook. Currently writing this on a desktop of 1280x800 (MacBook display) plus 1920x1080 on my monitor. Excellent colour, crisp image, no interference.
While I wouldn't normally comment on the seller, I think it's needed given the other 1 star review for this product. I received this item 3 days after ordering, which was 2 days before the earliest estimate. While the other reviewer clearly had a bad experience with the seller, he also did not take any action to rectify the situation. Basically, don't be concerned about ordering due to one person's ignorant review.