If you are looking for a low weight 40cm depth wooden rack, this is a reasonable choice. It is fairly low weight at only 13kg. But this is also its downside.
Without anything installed in the rack, the stability is not great, and for transport is requires both front and back covers to be attached.
But when the rack is filled, it seems sturdy enough for careful users.
It is constructed from 7mm plywood, and is therefore not recommended for any kind of heavy use, or rough handling.
I am using it for my amp/mixer rack (Behringer x32 Rack Mixer and 4x NX3000D Amps), and it handles my gear of 24kg, but i would not suggest to put more weight in it than that.