The assembly requires some skill (the screws are slightly recessed and due to the large size it is difficult to hold them alone and to feel the screws with the screwdriver, as you can hardly see them). But definitely reusable, like other lamps. I don't quite understand why it has to be returned to the box, but that should also be possible in principle.

That depends a little on the condition of the ceiling. Drilling holes in concrete is time-consuming... but in principle there is nothing to be said against repeated installation.