In my experienced opinion as a former customer of "Ovation Law"... these firms have some slick marketing stuff and all, but once you're "inside the door" you'll find they have no incentive (and they show it!) to expedite anything nor do they have any sense of urgency.
Add to that the fact that you still have to do a lot of the work on your own, answering their repeated emails, ranking your disputes in order of priority and sending them a multitude of credit report copies, and it just doesn't make sense to hire a law firm to do something you can now do fairly easily for yourself. Those firms seem intent on keeping you around for the monthly fees and stuff.
Overall, I found them to be a waste of a lot of money.