Very sturdy & well manufactured product that does what it's designed to do very well, but there are gotchas. The only thing clear about the instructions as that all measurements must be exact, a requirement that's hard to meet with an existing drawer/cabinet that you're trying to upgrade. It's obvious that you should construct your cabinet and drawers with this product's demands in mind. If you're installing into an existing drawer, allow a 40-hour week of trial and error and a garage full of tools, extra wood & sheet steel to compensate for irregularities that make the existing drawer incompatible with the slides' requirements. If you're an experienced cabinet maker and are starting from scratch, however, you'll be very pleased. Also, note that the undermount design is for a cabinet with sidewalls; if no sidewalls, you'll have to improvise the mounting to the floor of the cabinet. Seller should make all of this clear and provide step-by-step instructions, even for steps that seem obvious or intuitive to a professional.What great slides. Very smooth and easy to install. Quite sturdy and did I mention smooth?Overall slides work well. 8-12 weeks for Blums so I tried these. Directions aren't very good. Installation video on product page is for side mount slides so useless for bottom mounted slides. No such thing as a Lantan website or YouTube videos to help either so you're on your own. I made a couple of test drawers out of scrap to figure these slides out and I'd recommend anyone else do the same. Tolerances are pretty picky so try it first before using your good drawer stock. Price is virtually the same as Blums so not a bargain. If you need slides right now and can't wait for Blums these will work.Made a pull out tray for large dog food container. Worked perfectly.a beginner at drawers or inability to convert metric and inches is not for youEasy to install. Very sturdy and good price.The product is sturdy but the instructions to install are terrible. No rhyme or reason to them. No real instructions, just pictures.. Not for a do it yourself project.