It took me longer than expected (almost 2 hours) to assemble these stools, and it took 2 of us working together- one person holding the cross bar while other person tightened the screws.  It took "muscle" to get the screws fully tightened.  The wood plugs have not stayed on.  After stools have  acclimated, I will use a rubber mallet to tap buttons in, as I prefer not to use wood glue.  

Pros: The black color goes with our decor and size is perfect for our use.  Comfortable.  Allen key provided for assembly.
Cons: Took longer than expected to assemble.  Wood buttons not staying on....