The height specs are not correct! The minimum height is actually 31 1/2” not 27.56”, which is not even usable as a desk from a sofa. I was able to get the height down to 28” by removing the wheels and hacksawing 2” off the extendable left and right support tubes. There are triangular supports on the top of the extension tubes which, although strengthening the work surface, they also extend 2” below the top of the horizontal desktop support frame. These support brackets do not appear in the photo of the product on the website. The construction and quality is excellent, but the height issue makes the product almost totally unusable for a standard sofa height desk, and most standard height chairs!  It makes a good standing desk, but that was not what I intended to use it for! It can only be used as a desk for chairs or stools that are at least 22 1/2” tall!