We prefer top hung solid panel doors, and use quality tracks and running gear which provides a smooth gliding system. The weight being hung from the top track means the doors are less likely to bow and stop running properly due to ingress of dirt and dust collecting in a bottom running design.
We have used this configuration for many years and this system has proved very successful.
The photo was taken before the client has installed a new carpet. It is preferable to install the carpet after the units are fitted, although we can cut away new carpet to make sure we have the unit sitting on a sold foundation otherwise, over time the carpet will compress with the weight of the wardrobe and the unit could drop by 10mm - 15mm.