I've been using ball-bearing runners with full extension in my workshop for years. I ordered them because I needed them faster than my supplier could get them to me and now I wish I hadn't. I've always had good results and happy clients with full-size side-mount rails, but it's nothing short of a pain. Just as easy to install as all the others but the drawers were a lot harder to start up and noisy compared to others but the worst part is they just don't slide as smoothly and easily as the others. I wasn't happy, but worse, the customer wasn't. I will never order them again. I'm actually done with all the side assembly slides. I take a little more and use lower mounting rails from now on.