I use this tray on the horizontal section of my rack to mount a sampler and mixer using the hook-and-loop strips provided. It works perfectly and is made from tough powder-coated steel that isn't too heavy but also feels like it can support a fair bit of weight.
This is a great product—I would love to see others in different sizes. For example, vertically this covers about 10U space. A 6U would be very useful also.