We hesitated for quite a while to take this step to get the tallest toilet we could find.  We found it at Wayfair and are SO glad we did. Husband is 6'6" tall, we are elderly, husband installed with a little help from daughter.  We like it very much. It came via Fed Ex VERY well packaged. 
Highly recommend both this toilet and the Kohler Purefresh Lid to fit it (lid has great features).