Bought these chairs to replace old ones however one major problem is they are not safe on any solid surface ie laminate or tiled floors.
Unfortunately the ring underneath the chair base is solid plastic which slides  on those surfaces.we have had two accidents where the chair has tipped and slipped from underneath them and have landed on the floor.Now having to find silicone/rubber strips to prevent this happening again.Will definitely not let my grandchildren sit on them without an adult sat beside them.
On the plus side they are very comfortable,easy to put together and look great.I feel this is a design and safety issue.