We love the stools.  Assembly was easy with the exception of one stool - one screw hole was misaligned. 
But we worked that problem out and completed assembly of all 4 stools in a little less than 1.5 hours.
Some of the reviews complained about the lack of assembly instructions, however we had instructions with each stool.  They are similar to IKEA instructions - all pictures, few words. If you take the time to pre-assemble each screw with the proper lock washer and regular washer as shown in the pictures, then note which piece each screw goes with, you won't have any issues. We had no missing parts and no damaged pieces.