These look great and are plenty big/wide enough for an adult to sit on.  Easily adjust down while sitting on them.  Still have a bit of a chemical smell on the pad is the only reason why 4 stars, but I haven't sprayed them to clean yet, and fully expect the very slight smell to fade with time.  With the second picture you can see the size in relation to other chairs in my room.  Excellent value especially compared to the $300 barstools that they are replacing!  Can't speak to ease of installation as my dad put them together.  I didn't hear any complaints, however.