These chairs are perfect for my kids desks. You have to be heavy enough to use the raise & lower mechanisms but they are very fun. Seem sturdy even though I had trouble getting all of the screws to fit the back mount.  I bought 2 chairs and got 3 of 4 screws into one and 2 of 4 into the other.  Doesn't seem to effect the sturdiness  but time will tell.  Good chair for the money. Very bright colors.