We got these chairs about a month ago. They are not very sturdy but they hold up. They are only attached at the seat the rest of it can come apart with ease. We have them sitting on carpet right now and they are very wobbly. We intend to buy some wood to go under neath them all. Hopefully it will stable them a little more. 
When an adult sits on the chair they lower about a foot ( or at least that is how it feels). 
I like the bright color of our chairs. We got the red ones. 
If I were to do it again I would probably not buy them save up and get some that were made a little stronger.