I am thrilled with this shelving unit.  This is a high quality, sturdy piece.  As usual, I attempted a 2 person job alone.  Please note, if you are using the wheels, you need to put on the lock mechanism to keep it from rolling away from you!  These are very tall, so you will probably need a ladder to put the 2 or 3 top shelves on the poles (depending on where you want to space them).  Fortunately, I am light enough that I could step on one of the lower shelves to place the 2 highest shelves on the poles.  This helped me match the shelf corners with the poles.  The instructions were clear, and every piece fit perfectly.  I highly recommend this.