I needed a flight case big enough (and with strong wheels) room for two Amps, a controller and also room for a storage drawer plus air flow fill in plates. Only down side there are no rear rails for a plug rack to fit behind my short controller. Otherwise both sides connect and clip together well. When both side cases are I clipped and taken off it seems a little wobbly, but as soon as the components are bolted in it becomes rigid and feels good.