These are very comfortable and easy to put together. The only assembly issue I had was the caps on the bottom of the feet for the 24”version were very difficult to put on. In fact I apparently didn’t get them on correctly and now they are a little wobbly.  

When it said adjustable from 24-29” I thought it meant you could make them different sizes between 24” and 29” but you have a choice of  24” or 29”.