After assembling the chair I could plainly see the 5-caster base was smaller than the chair itself so I replaced the base with the base from the chair I replaced. Each arm of the old 5-caster base is 2 inches longer than the new one. A much more stable design so I disposed of the new base with the old chair. Otherwise the new chair is more comfortable than the old one.
WE came to buy one office chair and bought two of the same type. They were on sale too. the Clerk had no help due to no fault of her own and we came back to get the chairs a few hours later she had them pulled out of inventory and even help load them. WIN WIN
I bought the chair in the box. Assembled pretty easily. Chair has better lower back support than others in the same price range. It is pretty lightweight and I don't expect that it would hold up to heavy use It's more suited for occasional use.