This pen looks  great without having a heavy pen look in the house. The materials ( the acrylic panels and aluminum  sides are good  quality) However, I bought the largest one and find that it does not hold up  to a puppy jumping up very well. I was hoping  to keep the pen till my puppy reaches her adult size and I am not sure it will endure the strength of a large dog. Also there are caps  for the edges but they come off too easily and expose  very  sharp edges. For the moment it is  fine. Too much money for too little time. I have to put  chairs next to the panel to  withstand the pummelling of paws against the sides.