In hindsight I exposed the affair too late for it to have much of an impact. I had enough evidence, but with the other issues involved and the adversarial process the waters have been muddied.
I also didn't know then what I know now.
So... to expose or not to expose? It depends on your situation, and I think both sides to the debate have valid points. Each situation is different, and for some exposure might end the affair. For others it might drive a further wedge in between the LBS and the WAS.
In my situation I don't think it made much of a difference other than to rattle W and cause her to make legal mistakes.
"You can't reason someone out of a position they didn't reason themselves into."