Gizmos and Gears delighted my 5 year old granddaughter.  She has all but constructed a new machine for spinning yarn into gold.  She loves it and her inventiveness and creative juices are surpassing my highest expectations.  The brighter the child, the more appeal.  She turned 5 in July, and will enter 1st grade in August.  So parents who are thinking about purchasing this toy, by all means get it!  It will keep your children entertained for hours without supervision.  It is better than advertised!