Chairs seem to be sturdy. They are comfortable. I got two and one glides easier than the other, the one that "sticks" or "drags" while gliding is also a bit wonky and doesn't sit level whereas the other one does. The bearings are pressed in and my husband believes that the one that drags a bit during the glide motion may have had the bearing pressed unevenly but with use it should loosen up. And where we are going to use them the uneven base will not be a problem. Nice chair for the price. I may contact customer service about a replacement.