(+) Convenient to fit into a 19 "rack (data, audio or other) non-rackmount components (+) Design very solid, thick sheet metal reinforcement to ensure flatness (+) Screw and cage nut supplied (+) Expected to support equipment up to 15 kg (but I do not see what could weigh 15 Kg in this dimension?)
(-) Fairly heavy (if use in mobile audio rack, for example): 1.2 Kg! (- 1 star)