The rack mount serves to accommodate a mixer, an easy-access on / off 6-way power extension, a flat plate bar where I can customize to identify the instruments attached to the mixer, and accommodate a flexible led lightbar . 
 
Pros: - quality 
           - price 
           - simplicity 
           - suitable angle, but not adjustable. 
           - multi-uses 
 
Cons: - although it is not a defect, remember that the last positions of 
 the rack, due to the fixed angle of the stand, only admit 
 devices with little depth.