Easy to put together, my kids (7 and 10) pretty much did it. Rubber layer on bottom of the chrome floor piece-great when stools are moved so not to scrape the flooring. Adjustable level has to have a heavier type person in them to go up or down. They are actually sturdy for being so lightweight. So far after 5 days my kids have not fallen out of them,  "spun out" of control or managed to tip them over when sitting/climbing into them. The 2-3 inch 'lip' in the back of the stool feels like you're in a seat (without leaning back too much).