Excellent purchase.  We had no issues with assembly.  The corner pieces were stamped with the part number (I.e. 3A, 3B) and the only part that we had to pay close attention too were the corner post needed to have the screw holes lined up properly to the cross beams to ensure the screws went in smoothly.  

Our kids love this trampoline.  We have a screen across our garage door also so they can open the door and let the breeze in and jump or swing in the shade.  Although one child at a time is recommended we have let two of the smaller kids jump at the same time without any issues.  The jump surface is very sturdy.