These two are the most recent of several sizes I’ve purchased over the last couple of home projects and I could not be happier with their ease of installation and solid construction.  I even needed to slightly adjust the upper drawers for these two to lower their sweep just a little bit to have a full clearance in the window seat cabinet I installed them into.  Still had the wiggle room to unscrew the slides and being them down a bit without losing any function or depth.  Great quality!