These weren't hard to put together, I did all four myself in about 3.5 hours.  You need to be careful with the screws and not over tighten them or you will strip them out.  Also, you need to make sure that when you put the cushion on the chair, it is pushed evenly back into the chair or when you look at the back of the chair, you will be able to see that it's not perfect.  Chairs were all able to be made level with the adjustable feet that were on them.  I only had to adjust one leg on two different chairs as I was very aware of ensuring everything was straight when I put them together.  They seem sturdy enough but are lighter than anticipated.