Impact will be zero or worse. Happened to me. If you look at MyFico reports it even says the initial impact is the reporting of the debt and not much changes after that (outside of aging). As I understand it, often what happens is you take an older unpaid collection and turn it into a recent paid one, which is even worse (point wise).
If you don't get it off though, paying won't increase your score, might even hurt it, so if you *really* don't feel it is your debt it is best to dispute it and get it removed.
Message Edited by nyccc2 on 01-26-2008 08:22 AM