I just finished a year with Langhorne Debt. They are a complete joke and did not fulfill anything they advertised.
They tried to tell me that a $400 debt (from an illegal payday loan company) was purchased by a collection agency for $700 and that I should pay that amount. Of course I balked. A few weeks later, they sent an email saying they had settled for $490 and that they recommended I take this great deal. They hinted they would drop me if I didn't accept.
I didn't accept and finally told them to cancel their "service." Of course, this was after they got all their money from me.
They either don't answer questions or give vague responses. They do a pretty good job of making it seem like they are professionals and on your side, but I pretty much think they are a bunch of crooks.
I'm happy to provide more details offline or here.