This is a beautiful piece! It is heavy and well made. It took approximately 3.5 hours to assemble, quite a bit of time could be avoided if you know there are a few pilot holes to drill for the attachment of the top to the base cabinets. It is top/back heavy so adjust placement of the cabinets accordingly. 
Attached is my suggestion for assembly alteration steps to allow for an easier time using the brackets/where pilot holes will be needed. 
Overall, it’s great. My daughter loves the extra storage