The chair was fairly easy to assemble, however, the hydraulic rod, which powers the up/down action, was not secured and popped out as soon as we tried to use the chair. Please let people know to check and make sure the hydraulic cylinder and rod are screwed together tightly before operating the chair. Was a pretty easy fix for a mechanically adept person, but without help, I would have sent it back as being broken/ unusable. I have highlighted the cylinder  in the manual. This was not mentioned in the assembly packet. Would have been 5 stars otherwise.