When I was attaching the bottom bracket to the seat whatever nut is inside the seat broke loose about halfway in as I tried to screw in 2 of the 4 bolts required to secure it. As a result the bolts just spun around without tightening. I finished the assembly hoping it wouldn't be a big problem since the other two bolts screwed in tightly like they were supposed to. However the final result was an unstable uncomfortable chair. Staples took the chair back and issued a refund with no hassles.
I liked to overall look and comfort of the chair however the base/coasters were a bit taller than my pervious chairs base which made it sit higher than I liked (even when in the fully down position). So I switched out the base with my original chair's base/coasters making it the perfect fit for me and my desk (I am 6'3").
I bought two chairs. I give the 1st a 5 rating. The 2nd gets a 1 rating. Something went wrong during manufacturing and the holes in the arm and the bolt holes in the backrest don't align. When that part is replaced both chairs will earn 5+. More comfortable than my wife's car!