The quality is fabulous! I am 61 yrs old and 5 feet tall, female.... and i wad able to put this together alone in about 4 hours! I did not need the back panels and i already had a catio made from shelving.  I left the sides of that, because I have an overhang that needed to be covered.  This let me extend this catio out more and use the back panels to make it longer.  I even used the last panel to cover the remaining opening at the top. I l left the wire structure up next to the house so they can climb down.
I highly recommend this product.