These panels are great,  very durable.  My only issue is that when attaching the third (top) panel, the holes didn’t line up right - this was the case for 2 sets of the panels.  We studied, reviewed, analyzed, and scratched our heads as to why it wouldn’t line up, but they just didn’t.  It was easily fixed by drilling the last keyhole so it was a little longer.  With that, everything  fit perfectly.