Bought many furnitures before. This is the first disappointment. Very easy to install - just put three parts together. The adjuster for one chair is not working so I decided to return one. But I have a hard time to take it apart to put back into the box. The next day, the other chair keep sinking low when I am sitting on it to work on my computer in my kitchen counter, no matter how I try, the chair won't stay at the height I want.. So the second on is going back too.