What Song Chu offers is the built of the hardware, ie the stainless steel baskets but I cant comment on the moving parts. The con is really the limitation of the dimension, no flexibility, take their dimensions and fit in your kitchen. Yup a look alike Blum Tower unit but minus the cost of Blum. What you need to pay here are just the runners, while the carpenter can make the drawers with your preferred height, depth and length. Of cos Blum has a wider range of drawers to choose from, stainless steel, glasses etc but one drawer easily $100 up. And this additional come from your pocket, carpentry is not gonna reduce cost in any way if you choose Blum drawers. Matter of fact, I heard scenarios that carpenter charge more if using Blum, citing they need to attend a course to be certified Blum fitter. So let's take a step back, you want the functionality, cost efficient and aesthetics, get Blum runners and make sure your carpentry comes in Internal PVC coloured.