POOR QUALITY. DO NOT BUY.
UPDATE: I returned the first uneven set for replacement. I received a replacement. However the new set are STILL UNEVEN. same problem. It seems like a systemic issue not an isolated issue.

I assembled the first chair and it's uneven - one of the leg is roughly half inch from the floor - that's tolerable.
And I assembled the second one - guess what - the leg is ONE INCH away from the floor
the unevenness is hardly ignorable. The space is large enough to put a thick Roku remote.  it's a complete failure.

I wish I had read the reviews that has mentioned the unevenness.