The construction on these is pretty solid, but two main reasons for my 3 star review. The first is that there are no pads included for the bottom so if you aren't putting these on carpet they will slide around everywhere. The second is that the "carpet" which are really just 4 felt pads are held down by two skinny strips of velcro so they curl up on the sides and edges. Both easy fixes...hot glued down the fabric and then bought a $10 pack of rubberized stick on material for the bottom. Just OK though.