Politico was saying that this is going to get donor money flowing again. He has had some fundraising woes lately -- Romney has.
Also, they have not had effective ads. The clips from this -- again, according to that article -- will provide a lot of good material for future ads.
Plus, the increase in credibility will mean that more voters will be willing to actually listen to his message. For a few the message will resonate.
Unless there are some great Obama ads focusing on Romney's lying, I think it's a net good for Romney.