Unless you intend to have used wheels restored immediately or you collect old wheels, we would recommend against it. Most used wheels we have seen have unknown histories. They could be 10, 20, 30 years old or even older. Sadly, the spokes could have small cracks or defects in them that are hardly visible. Rust can be hiding like a cancer eating away at the spokes which could lead to a serious failure. The wheels could leak from dried-out or damaged inner liners resulting in costly towing bills. We have seen cases of wheels that have suffered catastrophic spoke failures which could lead to a loss of control of the automobile. You just can't be sure enough to risk your safety on used rims.