Well, first things first. They are made in China (not surprising). However, they seem to be quite well made. In order for the installation process to be smooth and easy, it depends on a few things. How well your cabinets are built and how square/parallel the rails are. If your drawers are bolted (i.e. falling apart or not square) it will also make installation more difficult. These rails are exactly 1/2" thick. So the drawers should have a little more clearance on each side. Oh yeah, that last one. THE SCREWS SUPPLIED ARE COMPLETE RUBBISH. I have a master set of screwdrivers and bits. none fit. They were too small for the bit/screwdriver to sit properly in the screw.