I really like these flip flops. They feel well made and sturdy and I like the slow closing action. However, my cabinet doesn't have perfectly straight sides and the rails have very tight tolerances. I had to use spacers very carefully and make many small adjustments to each slide. I installed 7 drawers and the last one was pretty good, but the first one took me and my friend a few hours to fix everything. If the surfaces you're installing the slides on aren't very straight and parallel to the edges of the drawer, and the distance between the drawer and the mounting surface isn't nearly exactly 1/2 inch, then buy some washers and be prepared the time to get it right. Now that they are installed they work fine. I have other cabinets that need drawers and will look for a different type of rail next time.