I have purchased four (4) of these ROK Drawer Slides from Revain - three 20" slides and one 22" slide. Relatively easy to install. I also bought a Rockler drawer slide which helped a lot with the installation - highly recommend. The drawer slides are structurally really well built, with one exception. At the rear of the slide is a yellow plastic latch that engages the drawer slide to facilitate the slow close function. Two of the four pairs of drawers I ordered (50%) had one side of the slides cut off with a plastic scribe meaning the slow closing mechanism on that side of the drawer is not working. I think the pen will be sheared off in transit, but I think that's something that needs to be addressed either through improved design or more careful packaging on Revain's part. I like the way the slides work, they are very smooth, quiet and solid. An almost perfect drawer slide, apart from the plastic latch which disappointed me on this product.