Not manufactured for easy assembly and assembly is not for the average homeowner.  The pocket holes in horizontal rails are not deep enough to allow the screws to engage the legs without cracking  the rails - See photos.  To overcome this I did three things (1) Drilled and 1/8" diameter pilot hole to extend all the way thru the rail's tenon.  (2) Using a 3/8" drill bit I extended the pocket hole (the portion where the screw head rests) at least a 1/4" deeper so the screw would actually screw into the leg. (3) Applied wood glue inside the mortis slot were the end of the rail fits into, clamped the legs together to make sure the rails are fully seated into the slots, and drove the screws home.  The maker needs to chance the manufacturing process for the rails to drill the pocket holes deeper.  Other than the issues with assembly I like the look of the stools.  Lets hope they hold up due to the issues with the rail assembly