As others have mentioned, the plastic on this stuff is *really* flimsy.  Getting the end pieces on (the first step) was a challenge because pushing hard enough to get them to "click" into place bowed the bottom piece.  The side pieces were very poorly extruded, and were very difficult to get into place because of excess, untrimmed plastic and the thin plastic bowing on the edge.  But I eventually did get everything together and it'll do for storing my yard equipment.  I wouldn't let anyone sit on it, though.  Maybe a kid, but for me, I'll be putting burger fixings on it, since I really don't trust it to hold the 400 pounds it claims it can.

Despite the quality, the assembly was mostly easy, and this is the largest box I could find, so it's pretty useful.  Not bad to look at, either.