I bought two slide-a-shelf for my pots, pans and casserole dish cupboard.  I read their instructions and measuring guide very carefully before ordering and was able to maximize the size for my cupboard so that I got a perfect fit.  I installed some L-brackets in the upper shelf for stability before installing the slide-a-shelf.  There is a fair bit of weight on the shelves now but it's very smooth and solid when opening.  I found all instructions easy to follow and accurate and shipping was pretty quick.  Quality of the drawers and hardware is very nice as well.  I'm very pleased with these drawers and will be ordering a few more.