These are a popular chair here in our office as everyone has one and love them. We did have the hydraulics go out on the newest one I suppose it was made during covid. But Staples quickly replaced it.
Bought mine at the he beginning of the pandemic. About a year ago the mesh started to pull away to the point of was sitting on the metal frame. Then the hydraulic mechanism pushed it's way through the plastic base splitting it. It was all repaired under warranty. Took several weeks to get the parts. Another year has gone by and the base has split again. I'll get it fixed under warranty again but I'm sidelining the chair and will but something else to use as my daily. The plastic base has a tapered section which mated to the tapered pneumatic cylinder. Downward forces causes an outward force. If they used a step instead of a taper this would not occur.